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Wilkins Home

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

Model 350 (Sizes 2-1/2

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

Models
SKU Description Price Qty
212-350 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $1,337.69
212-350OSYPI 2 1/2" 2-1/2" 350 W/OSY & PI GV LEAD FREE $1,960.96
212-350G 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $1,765.26
212-350L 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $1,099.06
212-350OSYFG 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $1,960.96
212-350OSYFSC 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FSC Strainer $2,146.06
212-350OSYFS 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $2,075.75
212-350OSY 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $1,493.23
212-350FG 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $1,765.26
212-350FSC 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $1,897.61
212-350FS 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $1,827.28
212-350LBSE 2 1/2" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $742.97
212-350BSE 2 1/2" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $1,548.34
212-350OSYG 2 1/2" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $1,960.96


Repair Kits
SKU Description Price Qty
RK212-350 REPAIR KIT MODEL 350 & 450, 2 1/2", 3" $25.85
Models
SKU Description Price Qty
3-350 3" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $1,386.00
3-350OSYPIFG 3" 3"350 W/FXF OSY FXG PI GV LEAD FREE $2,096.09
3-350OSYGF 3" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged OSY $2,096.09
3-350G 3" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $1,797.91
3-350L 3" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $1,120.55
3-350OSYFG 3" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $2,096.09
3-350OSYFSC 3" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FSC Strainer $2,325.09
3-350OSYFS 3" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $2,257.52
3-350OSY 3" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $1,516.46
3-350FG 3" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $1,797.91
3-350NRSPI 3" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged PI $1,947.00
3-350FSC 3" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $2,026.99
3-350FS 3" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $1,959.36
3-350LBSE 3" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $694.09
3-350BSE 3" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $1,620.42


Repair Kits
SKU Description Price Qty
RK212-350 REPAIR KIT MODEL 350 & 450, 2 1/2", 3" $25.85
Models
SKU Description Price Qty
4-350 4" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $1,808.62
4-350NRSOSY 4" 4" 350 W/NRSxOSY GV LEAD FREE $2,401.16
4-350OSYPIFG 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved PI $2,593.45
4-350PIOSY 4" Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $2,593.45
4-350PIOSYFG 4" Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Grooved OSY $2,593.45
4-350LFS 4" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FS Strainer, Less Gate Valves $1,697.72
4-350LFSC 4" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FSC Strainer, Less Gate Valves $1,748.63
4-350L 4" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $1,532.25
4-350GF 4" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Flanged NRS $2,208.84
4-350G 4" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $2,208.84
4-350OSYGF 4" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged OSY $2,593.45
4-350OSYPIGF 4" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged PI $2,593.45
4-350OSYG 4" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $2,593.45
4-350OSYPIG 4" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved PI $2,593.45
4-350PIOSYGF 4" Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Flanged OSY $2,593.45
4-350OSYFG 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $2,593.45
4-350OSYPI 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged PI $2,593.45
4-350LBSE-RPCK 4" 4"350L W/BS10 E W/RP#1 CK $1,159.00
4-350LBSD 4" Double Check Valve, Lead-Free, Flanged Body, British BS10 D Flanged x Flanged $1,017.48
4-350BSE 4" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $2,186.04
4-350LBSE 4" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $1,138.29
4-350FSC 4" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, Epoxy Coated Strainer $2,586.15
4-350FS 4" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $2,463.69
4-350FG 4" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $2,208.84
4-350OSY 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $1,784.77
4-350OSYFSC 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Epoxy Coated Strainer $2,970.76
4-350OSYFS 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $2,848.30
4-350OSYMU 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Mueller GV $3,081.72
4-350OSYSB 4" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, SS Bolts $2,770.24
4-350PIOSYG 4" Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Grooved OSY $2,593.45


Repair Kits
SKU Description Price Qty
RK4-350 REPAIR KIT MODEL 350 4" $91.85
Models
SKU Description Price Qty
6-350 6" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $2,609.38
6-350LBSE-RPCK 6" 6"350L W/BS10 E W/RP#1CK $1,677.20
6-350PIOSY 6" Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $3,582.13
6-350LFS 6" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FS Strainer, Less Gate Valves $2,655.96
6-350LFSC 6" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, FSC Strainer, Less Gate Valves $2,766.33
6-350L 6" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $2,345.76
6-350GF 6" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Flanged NRS $3,260.49
6-350G 6" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $3,260.49
6-350OSYGF 6" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Flanged OSY $3,582.13
6-350OSYG 6" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $3,582.13
6-350OSYPIG 6" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved PI $3,582.13
6-350PIOSYG 6" Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Grooved OSY $3,582.13
6-350OSYPIFG 6" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved PI $3,582.13
6-350OSYFG 6" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $3,582.13
6-350BSE 6" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $2,979.34
6-350LBSE 6" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $1,596.15
6-350FS 6" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $3,625.00
6-350FSC 6" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $3,764.99
6-350FG 6" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $3,260.49
6-350OSY 6" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $2,709.38
6-350OSYFSC 6" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Epoxy Coated Strainer $4,077.30
6-350OSYFS 6" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $3,937.39
6-350OSYPI 6" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged PI $3,582.13
6-350PIPIG 6" Double Check Valve, Lead-Free, Flanged Body, Grooved PI x Grooved PI $3,582.13


Repair Kits
SKU Description Price Qty
RK6-350 REPAIR KIT MODEL 350, 6" $165.47
Models
SKU Description Price Qty
8-350 8" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $4,825.07
8-350OSYRH 8" 8" 350 W/RT HND GATE VLV $6,929.54
8-350OSYPI 8" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged PI $6,180.49
8-350OSYFG 8" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $6,180.49
8-350OSYPIFG 8" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved PI $6,180.49
8-350PIOSY 8" Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $6,180.49
8-350PIOSYFG 8" Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Grooved OSY $6,180.49
8-350L 8" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $4,306.20
8-350G 8" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $5,754.03
8-350OSYG 8" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $6,180.49
8-350OSYFS 8" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $7,146.43
8-350OSYFSC 8" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, Epoxy Coated Strainer $7,396.43
8-350OSY 8" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $4,921.01
8-350LBSE-DACHK 8" 8" 350L W/BS10 E W/DA#2CK $3,663.91
8-350LBSE-RPCK 8" 8" 350L W/BS10 E W/RP#1CK $3,663.91
8-350BSE 8" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $5,338.99
8-350LBSE 8" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $3,215.06
8-350FSC 8" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, Epoxy Coated Strainer $6,969.99
8-350FS 8" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $6,719.97
8-350FG 8" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $5,754.03
8-350OSYPIG 8" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved PI $6,180.49


Repair Kits
SKU Description Price Qty
RK8-350 REPAIR KIT MODEL 350 8", 10", 12" $194.37
Models
SKU Description Price Qty
10-350 10" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $7,248.70
10-350BSE 10" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged $6,749.61
10-350L 10" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $5,895.62
10-350G 10" Double Check Valve, Lead-Free, Flanged Body, Grooved NRS x Grooved NRS $8,528.14
10-350PIOSY 10" Double Check Valve, Lead-Free, Flanged Body, Flanged PI x Flanged OSY $8,686.52
10-350OSYFG 10" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Grooved OSY $8,686.52
10-350OSYFSC 10" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FSC Strainer $10,790.81
10-350OSYFS 10" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY, FS Strainer $10,266.49
10-350OSY 10" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $7,344.49
10-350FG 10" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Grooved NRS $8,528.20
10-350FSC 10" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FSC Strainer $10,632.51
10-350FS 10" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS, FS Strainer $10,108.19
10-350LBSE 10" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves, With RP #1 Check $3,415.72
10-350LBSE-RPCK 10" Double Check Valve, Lead-Free, Flanged Body, British BS10 Flanged x Flanged, Less Gate Valves $3,475.67
10-350OSYG 10" Double Check Valve, Lead-Free, Flanged Body, Grooved OSY x Grooved OSY $8,686.52


Repair Kits
SKU Description Price Qty
RK8-350 REPAIR KIT MODEL 350 8", 10", 12" $194.37
Models
SKU Description Price Qty
12IN-350 12" Double Check Valve, Lead-Free, Flanged Body, Flanged NRS x Flanged NRS $11,783.29
12IN-350OSY 12" Double Check Valve, Lead-Free, Flanged Body, Flanged OSY x Flanged OSY $11,987.43
12IN-350L 12" Double Check Valve, Lead-Free, Flanged Body, Flanged x Flanged, Less Gate Valves $8,949.70


Repair Kits
SKU Description Price Qty
RK8-350 REPAIR KIT MODEL 350 8", 10", 12" $194.37


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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