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Wilkins Double Check Assembly

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Model 450 (Sizes 2-1/2" - 10")

Model 450 (Sizes 2-1/2" - 10")

Designed for installation on potable water lines to protect against both backsiphonage and backpressure of polluted water into the potable water supply. The Model 450 shall provide protection where a potential health hazard does not exist. Ideal for use where lead-free* valves are required.

  • "N" pattern construction provides small footprint
  • Excellent for retrofit installation in small spaces
  • Compound Check yields very low headloss
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SKU Description 10" Price Qty
10-450 10" 10-450 Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS $12,540.70
10-450FG 10" 10-450FG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Grooved NRS $12,745.80
10-450OSY 10" 10-450OSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY $12,773.88
10-450OSYFG 10" 10-450OSYFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Grooved OSY $12,982.74
10-450BGVIC 10" 10-450BGVIC Double Check Valve Assy, Lead-Free, N-Pattern, Grooved BGVIC x Grooved BGVIC $13,751.69
10-450G 10" 10-450G Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Grooved NRS $12,745.80
10-450OSYGF 10" 10-450OSYGF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Flanged OSY $12,982.74
10-450OSYG 10" 10-450OSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved OSY $12,773.94
10-450L 10" 10-450L Double Check Valve Assy, Lead-Free, N-Pattern, Grooved x Grooved, Less Gate Valves $8,669.99
SKU Repair Kits 10" Price Qty
RK8-350 RK8-350 Repair Kit - 375/475 Checks Only $216.26
SKU Description 8" Price Qty
8-450 8" 8-450 Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS $7,623.04
8-450FG 8" 8-450FG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Grooved NRS $7,747.64
8-450OSY 8" 8-450OSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY $8,161.60
8-450MUOSY 8" 8-450MUOSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY, Mueller Gates $9,395.03
8-450MUOSY 8" 8-450MUOSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY, Mueller Gates $9,395.03
8-450OSYFG 8" 8-450OSYFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Grooved OSY $8,161.66
8-450BGVIC 8" 8-450BGVIC Double Check Valve Assy, Lead-Free, N-Pattern, Grooved BGVIC x Grooved BGVIC $9,132.85
8-450G 8" 8-450G Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Grooved NRS $7,747.64
8-450OSYGF 8" 8-450OSYGF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Flanged OSY $8,295.14
8-450OSYG 8" 8-450OSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved OSY $8,161.66
8-450OSYPIG 8" 8-450OSYPIG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved PI $8,161.66
8-450PIBGVICG 8" 8-450PIBGVICG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved PI x Grooved BGVIC $8,714.04
8-450L 8" 8-450L Double Check Valve Assy, Lead-Free, N-Pattern, Grooved x Grooved, Less Gate Valves $5,888.71
SKU Repair Kits 8" Price Qty
RK8-350 RK8-350 Repair Kit - 375/475 Checks Only $216.26
SKU Description 6" Price Qty
6-450LDR 6" 450 L/GV DR $2,479.82
6-450 6" 6-450 Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS $4,487.52
6-450FG 6" 6-450FG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Grooved NRS $4,487.58
6-450OSY 6" 6-450OSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY $4,830.49
6-450OSYFG 6" 6-450OSYFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Grooved OSY $4,830.55
6-450BGVIC 6" 6-450BGVIC Double Check Valve Assy, Lead-Free, N-Pattern, Grooved BGVIC x Grooved BGVIC $5,067.34
6-450GF 6" 6-450GF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Flanged NRS $4,487.58
6-450G 6" 6-450G Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Grooved NRS $4,487.58
6-450OSYGF 6" 6-450OSYGF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Flanged OSY $4,830.55
6-450OSYG 6" 6-450OSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved OSY $4,830.55
6-450L 6" 6-450L Double Check Valve Assy, Lead-Free, N-Pattern, Grooved x Grooved, Less Gate Valves $3,195.35
SKU Repair Kits 6" Price Qty
RK6-350 6" RK6-350 Repair Kit - 375/475 Checks Only $195.17
SKU Description 4" Price Qty
4-450LDR 4" 375 L/GV DR $1,811.06
4-450 4" 4-450 Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS $3,183.56
4-450FG 4" 4-450FG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Grooved NRS $3,183.50
4-450OSY 4" 4-450OSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY $3,394.86
4-450OSYFG 4" 4-450OSYFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Grooved OSY $3,394.79
4-450PIBGVICFG 4" 4-450PIBGVICFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged PI x Grooved BGVIC $3,499.48
4-450BGVIC 4" 4-450BGVIC Double Check Valve Assy, Lead-Free, N-Pattern, Grooved BGVIC x Grooved BGVIC $3,667.64
4-450GF 4" 4-450GF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Flanged NRS $3,183.50
4-450G 4" 4-450G Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Grooved NRS $3,183.50
4-450OSYGF 4" 4-450OSYGF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Flanged OSY $3,394.79
4-450OSYG 4" 4-450OSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved OSY $3,394.79
4-450OSYPIG 4" 4-450OSYPIG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved PI $3,394.79
4-450PIBGVICG 4" 4-450PIBGVICG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved PI x Grooved BGVIC $3,499.48
4-450PIOSYG 4" 4-450PIOSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved PI x Grooved OSY $3,394.79
4-450L 4" 4-450L Double Check Valve Assy, Lead-Free, N-Pattern, Grooved x Grooved, Less Gate Valves $2,070.78
SKU Repair Kits 4" Price Qty
RK4-350 4" RK4-350 Repair Kit - 375/475 Checks Only $116.74
SKU Description 3" Price Qty
3-450 3" 3-450 Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS $2,376.38
3-450FG 3" 3-450FG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Grooved NRS $2,376.47
3-450OSY 3" 3-450OSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY $2,864.10
3-450OSYFG 3" 3-450OSYFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Grooved OSY $2,864.23
3-450G 3" 3-450G Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Grooved NRS $2,376.47
3-450OSYGF 3" 3-450OSYGF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Flanged OSY $2,864.23
3-450OSYG 3" 3-450OSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved OSY $2,864.23
3-450L 3" 3-450L Double Check Valve Assy, Lead-Free, N-Pattern, Grooved x Grooved, Less Gate Valves $1,854.11
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
212-450 2 1/2" 212-450 Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS $2,259.42
212-450FSC 2 1/2" 212-450FSC Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Flanged NRS, Epoxy Coated Strainer $2,501.71
212-450FG 2 1/2" 212-450FG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged NRS x Grooved NRS $2,285.48
212-450OSY 2 1/2" 212-450OSY Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Flanged OSY $2,730.50
212-450OSYFG 2 1/2" 212-450OSYFG Double Check Valve Assy, Lead-Free, N-Pattern, Flanged OSY x Grooved OSY $2,730.50
212-450G 2 1/2" 212-450G Double Check Valve Assy, Lead-Free, N-Pattern, Grooved NRS x Grooved NRS $2,259.42
212-450OSYGF 2 1/2" 212-450OSYGF Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Flanged OSY $2,730.50
212-450OSYG 2 1/2" 212-450OSYG Double Check Valve Assy, Lead-Free, N-Pattern, Grooved OSY x Grooved OSY $2,730.50
212-450L 2 1/2" 212-450L Double Check Valve Assy, Lead-Free, N-Pattern, Grooved x Grooved, Less Gate Valves $1,854.11
SKU Repair Kits 2-1/2" Price Qty
RK212-350 3" RK212-350 Repair Kit - 375/475 Checks Only $35.53
Documents
Specification Sheet - 2-1/2" & 3" PDF icon
Specification Sheet - 4", 6", 8" & 10" PDF icon
Installation and Maintenance Instructions 8" & 10" PDF icon
Installation and Maintenance Instructions 4" & 6" PDF icon
Installation and Maintenance Instructions 2-1/2" & 3" PDF icon
Repair Parts 2-1/2" & 3" PDF icon
Repair Parts 4" -10" PDF icon


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  • 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!

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  • 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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