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Air Delights Commercial Restroom Products

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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