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Wilkins Double Check Valve Assembly

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Model 350 (Sizes 2-1/2" -12")

Model 350 (Sizes 2-1/2" -12")

Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water supply. The Model 350 shall provide protection where a potential health hazard does not exist.

Double Check Valve Assembly

  • Short lay length makes replacement easier
  • Available in flanged, grooved, or grooved X flanged
  • Compound Check yields very low headloss
  • Repair Kits listed below
SKU Description 12" Price Qty
12IN-350 12" 12IN-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $16,165.51
12IN-350OSY 12" 12IN-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $16,537.73
12IN-350L 12" 12IN-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $9,825.49
SKU Repair Kits 12" Price Qty
RK8-350 RK8-350 Repair Kit - 375/475 Checks Only $216.26
SKU Description 10" Price Qty
10-350 10" 10-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $10,773.97
10-350BSE 10" 10-350BSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $8,527.03
10-350L 10" 10-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $7,448.22
10-350G 10" 10-350G Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $10,774.03
10-350PIOSY 10" 10-350PIOSY Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $10,974.04
10-350OSYFG 10" 10-350OSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $10,974.04
10-350OSYFSC 10" 10-350OSYFSC Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FSC Strainer $13,855.40
10-350OSYFS 10" 10-350OSYFS Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $13,182.17
10-350OSY 10" 10-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $10,974.04
10-350FG 10" 10-350FG Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $10,950.20
10-350FSC 10" 10-350FSC Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $13,652.15
10-350FS 10" 10-350FS Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $12,978.91
10-350LBSE 10" 10-350LBSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves, With RP #1 Check $4,469.56
10-350LBSE-RPCK 10" 10-350LBSE-RPCK Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $4,462.76
10-350OSYG 10" 10-350OSYG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $10,974.04
SKU Repair Kits 10" Price Qty
RK8-350 RK8-350 Repair Kit - 375/475 Checks Only $216.26
SKU Description 8" Price Qty
8-350 8" 8-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $7,269.31
8-350OSYRH 8" 350 W/RT HND GATE VLV $8,754.44
8-350OSYPI 8" 8-350OSYPI Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged PI $7,808.06
8-350OSYFG 8" 8-350OSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $7,808.06
8-350OSYPIFG 8" 8-350OSYPIFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved PI $7,808.06
8-350PIOSY 8" 8-350PIOSY Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $7,808.06
8-350PIOSYFG 8" 8-350PIOSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Grooved OSY $7,808.06
8-350L 8" 8-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $5,802.84
8-350G 8" 8-350G Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $7,269.31
8-350OSYG 8" 8-350OSYG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $7,808.06
8-350OSYFS 8" 8-350OSYFS Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $9,176.02
8-350OSYFSC 8" 8-350OSYFSC Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Epoxy Coated Strainer $9,344.24
8-350OSY 8" 8-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $7,808.06
8-350LBSE-DACHK 8" 350L W/BS10 E W/DA#2CK $4,794.25
8-350LBSE-RPCK 8" 350L W/BS10 E W/RP#1CK $4,704.46
8-350BSE 8" 8-350BSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $6,745.09
8-350LBSE 8" 8-350LBSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $4,206.94
8-350FSC 8" 8-350FSC Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, Epoxy Coated Strainer $8,805.48
8-350FS 8" 8-350FS Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $8,628.44
8-350FG 8" 8-350FG Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $7,269.31
8-350OSYPIG 8" 8-350OSYPIG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved PI $7,808.06
SKU Repair Kits 8" Price Qty
RK8-350 RK8-350 Repair Kit - 375/475 Checks Only $216.26
SKU Description 6" Price Qty
6-350 6" 6-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $4,266.34
6-350LBSE-RPCK 6"350L W/BS10 E W/RP#1CK $2,153.52
6-350PIOSY 6" 6-350PIOSY Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $4,687.15
6-350LFS 6" 6-350LFS Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FS Strainer, Less Gate Valves $3,410.26
6-350LFSC 6" 6-350LFSC Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FSC Strainer, Less Gate Valves $3,619.80
6-350L 6" 6-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $3,069.43
6-350GF 6" 6-350GF Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Flanged NRS $4,266.41
6-350G 6" 6-350G Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $4,266.41
6-350OSYGF 6" 6-350OSYGF Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged OSY $4,687.15
6-350OSYG 6" 6-350OSYG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $4,687.15
6-350OSYPIG 6" 6-350OSYPIG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved PI $4,687.15
6-350PIOSYG 6" 6-350PIOSYG Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Grooved OSY $4,687.15
6-350OSYPIFG 6" 6-350OSYPIFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved PI $4,687.15
6-350OSYFG 6" 6-350OSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $4,687.15
6-350BSE 6" 6-350BSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $3,898.46
6-350LBSE 6" 6-350LBSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $2,026.27
6-350FS 6" 6-350FS Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $4,654.50
6-350FSC 6" 6-350FSC Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $5,073.65
6-350FG 6" 6-350FG Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $4,266.41
6-350OSY 6" 6-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $4,687.21
6-350OSYFSC 6" 6-350OSYFSC Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Epoxy Coated Strainer $5,494.39
6-350OSYFS 6" 6-350OSYFS Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $5,055.61
6-350OSYPI 6" 6-350OSYPI Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged PI $4,687.21
6-350PIPIG 6" 6-350PIPIG Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Grooved PI $4,599.46
SKU Repair Kits 6" Price Qty
RK6-350 6" RK6-350 Repair Kit - 375/475 Checks Only $195.17
SKU Description 4" Price Qty
4-350 4" 4-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $2,890.27
4-350NRSOSY 4" 350 W/NRSxOSY GV LEAD FREE $3,141.90
4-350OSYPIFG 4" 4-350OSYPIFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved PI $3,393.53
4-350PIOSY 4" 4-350PIOSY Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $3,393.53
4-350PIOSYFG 4" 4-350PIOSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Grooved OSY $3,393.53
4-350LFS 4" 4-350LFS Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FS Strainer, Less Gate Valves $2,179.87
4-350LFSC 4" 4-350LFSC Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FSC Strainer, Less Gate Valves $2,219.82
4-350L 4" 4-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $1,945.12
4-350GF 4" 4-350GF Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Flanged NRS $2,890.27
4-350G 4" 4-350G Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $2,890.27
4-350OSYGF 4" 4-350OSYGF Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged OSY $3,393.53
4-350OSYPIGF 4" 4-350OSYPIGF Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged PI $3,393.53
4-350OSYG 4" 4-350OSYG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $3,393.53
4-350OSYPIG 4" 4-350OSYPIG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved PI $3,393.53
4-350PIOSYGF 4" 4-350PIOSYGF Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Flanged OSY $3,393.53
4-350OSYFG 4" 4-350OSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $3,393.53
4-350OSYPI 4" 4-350OSYPI Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged PI $3,393.53
4-350LBSE-RPCK 4"350L W/BS10 E W/RP#1 CK $1,488.16
4-350LBSD 4" 4-350LBSD Double Check Valve, Lead-Free, Flanged Body, British BS10 D Flanged x Flanged $1,291.69
4-350BSE 4" 4-350BSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $2,860.45
4-350LBSE 4" 4-350LBSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $1,445.03
4-350FSC 4" 4-350FSC Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, Epoxy Coated Strainer $3,384.00
4-350FS 4" 4-350FS Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $3,163.38
4-350FG 4" 4-350FG Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $2,890.27
4-350OSY 4" 4-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $3,393.53
4-350OSYFSC 4" 4-350OSYFSC Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Epoxy Coated Strainer $3,887.27
4-350OSYFS 4" 4-350OSYFS Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $3,657.22
4-350OSYMU 4" 4-350OSYMU Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Mueller GV $3,956.93
4-350OSYSB 4" 4-350OSYSB Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, SS Bolts $3,624.84
4-350PIOSYG 4" 4-350PIOSYG Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Grooved OSY $3,393.53
SKU Repair Kits 4" Price Qty
RK4-350 4" RK4-350 Repair Kit - 375/475 Checks Only $116.74
SKU Description 3" Price Qty
3-350 3" 3-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $2,352.54
3-350OSYPIFG 3"350 W/FXF OSY FXG PI GV LEAD FREE $2,742.77
3-350OSYGF 3" 3-350OSYGF Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged OSY $2,742.77
3-350G 3" 3-350G Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $2,352.54
3-350L 3" 3-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $1,422.59
3-350OSYFG 3" 3-350OSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $2,742.77
3-350OSYFSC 3" 3-350OSYFSC Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FSC Strainer $3,042.41
3-350OSYFS 3" 3-350OSYFS Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $2,898.66
3-350OSY 3" 3-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $2,742.77
3-350FG 3" 3-350FG Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $2,352.54
3-350NRSPI 3" 3-350NRSPI Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged PI $2,499.95
3-350FSC 3" 3-350FSC Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $2,652.34
3-350FS 3" 3-350FS Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $2,515.82
3-350LBSE 3" 3-350LBSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $944.16
3-350BSE 3" 3-350BSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $2,057.00
SKU Repair Kits 3" Price Qty
RK212-350 3" RK212-350 Repair Kit - 375/475 Checks Only $35.53
SKU Description 2-1/2" Price Qty
212-350 2 1/2" 212-350 Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $2,240.88
212-350OSYPI 2-1/2" 350 W/OSY & PI GV LEAD FREE $2,565.90
212-350G 2 1/2" 212-350G Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $2,240.88
212-350L 2 1/2" 212-350L Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $1,395.23
212-350OSYFG 2 1/2" 212-350OSYFG Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $2,565.90
212-350OSYFSC 2 1/2" 212-350OSYFSC Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FSC Strainer $2,808.19
212-350OSYFS 2 1/2" 212-350OSYFS Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $2,665.26
212-350OSY 2 1/2" 212-350OSY Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $2,565.90
212-350FG 2 1/2" 212-350FG Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $2,240.88
212-350FSC 2 1/2" 212-350FSC Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $2,483.04
212-350FS 2 1/2" 212-350FS Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $2,346.23
212-350LBSE 2 1/2" 212-350LBSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $1,010.59
212-350BSE 2 1/2" 212-350BSE Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $1,965.60
212-350OSYG 2 1/2" 212-350OSYG Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $2,565.90
SKU Repair Kits 2-1/2" Price Qty
RK212-350 3" RK212-350 Repair Kit - 375/475 Checks Only $35.53
Documents
Specification Sheet PDF icon
Installation and Maintenance Instructions 2-1/2" - 6" PDF icon
Installation and Maintenance Instructions 8" & 10" PDF icon
Repair Parts 2-1/2" & 3" PDF icon
Repair Parts 4" - 12" PDF icon
Videos
Model 350 (2 1/2" & 3") Repair Video YouTube Videos
Model 350 (8" - 12") Repair Video YouTube Videos
Model 350 (4" & 6") Repair Video YouTube Videos


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See What Our Customers Are Saying

  • I have been out-of-touch with Air Delights for some years. When I decided to return, they were there, ready and able to help me. They even had my old order records from years back. This was a great help to me. I didn't even need to order new dispensers , because my old ones worked just like new.

  • Due to our order history they followed up with a phone call to ensure what was ordered was actually what we wanted. Turns out we ordered incorrectly. They made the adjustment on the phone and shipped the correct item.

  • From seeing the pop-up ad, through ordering the needed parts cheaper than factory pricing, to installing for a flushable toilet again---THREE DAYS ONLY!!! Impressive, outstanding, and better than most!

  • I've been using products from Air Delights for years and have loved all of the products that I purchased. There have never been any problems with the products or customer service. I've actually gotten some of my friends interested in the products.

  • I've dealt with you folks before so I know the kind of service I will receive. I like the fact that there is a place like yours that people can shop at and get the service we deserve. I've decided we needed another set of this product in our upstairs bathroom since we have someone else utilizing the downstairs bathroom. GREAT SERVICE!

  • They expedited shipping to me and got it her super fast and were MORE than courteous when I called. The Best!

  • This commercial supplier has always been patient with my household sized orders. They even called once when what I had ordered was not the same as my previous orders. Saved me from having to return a mistaken order. I love their air freshener products. It's not always easy to find air fresheners that I can use with my allergies.

  • Your company is the best.You save me money on the part that I needed.Also I will be order off your company if I need anything else.

  • Our Flushmate 503 developed a broken cartridge at 4PM central time. AirDelights is pacific time, so by the time I placed my order it was 2:47 pacific time. They sent the parts by FEDEX next day standard delivery. I had the parts in my hand in St Louis MO at 10:18 AM the next morning. The order was before 3PM so they shipped the same day.

  • Ease of ordering and length of time on delivery and the pleasing aroma of items purchased are all great! I will be purchasing more in the near future. Thanks to everyone involved with my order.


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