Backflow Preventer

Inline backflow preventer for sprinklers?

I have installed an irrigation system of sprinkler heads with 1/2" pipe on a hillside. The problem is that when the sprinkler valve shuts off, the residual water left in the lines drain out through the lowest sprinkler head which is a lot of water and is pretty wasteful. Is there an inline backflow preventer that I can install just after that sprinkler head?

There is an irrigation part called a check valve. There is a flap inside that the water pressure will allow it to open, then close if the water comes from the opposite direction. All irrigation parts store have them for a few bucks.

Discover Backflow Preventer On eBay Below:

Wilkins 975XL 975XL2 Backflow Preventer Air Gap 1 4 1 2 MPN AG 8
Wilkins 975XL 975XL2 Backflow Preventer Air Gap 1 4 1 2 MPN AG 8
$60.00
LEGEND VALVE 115 114 BACKFLOW PREVENTER NEW IN BOX
LEGEND VALVE 115 114 BACKFLOW PREVENTER NEW IN BOX
$68.00
WATTS 1 1 4 BACKFLOW PREVENTER REDUCED PRESSURE ZONE ASSEMBLY RPZ MOD 009 1 1 4
WATTS 1 1 4 BACKFLOW PREVENTER REDUCED PRESSURE ZONE ASSEMBLY RPZ MOD 009 1 1 4
$300.00
Watts Fluid Air 8A Back Siphonage Backflow Preventer Pack of 3
Watts Fluid Air 8A Back Siphonage Backflow Preventer Pack of 3
$66.77
WATTS 909 LF 4 BACKFLOW PREVENTER 0385801
WATTS 909 LF 4 BACKFLOW PREVENTER 0385801
$1,988.88
WATTS 3 4 9D M2 BACKFLOW PREVENTER NEW IN BOX
WATTS 3 4 9D M2 BACKFLOW PREVENTER NEW IN BOX
$51.00
Watts Regulator 8A Siphonage 3 4 Backflow Preventer
Watts Regulator 8A Siphonage 3 4 Backflow Preventer
$6.99
2 INCH BACKFLOW PREVENTER APOLLO CONBRACO 40208T2 2 IN BARELY USED
2 INCH BACKFLOW PREVENTER APOLLO CONBRACO 40208T2 2 IN BARELY USED
$280.00
HONEYWELL BACKFLOW PREVENTER W FILLMATIC PRESSURE REDUCING VALVE BP900
HONEYWELL BACKFLOW PREVENTER W FILLMATIC PRESSURE REDUCING VALVE BP900
$69.99
O RINGS SERIES 909 REDUCED PRESSURE ZONE BACKFLOW PREVENTERS 3 4 AND 2 G59
O RINGS SERIES 909 REDUCED PRESSURE ZONE BACKFLOW PREVENTERS 3 4 AND 2 G59
$11.03
Ames 4000SS 5000SS Backflow Preventer RV Sensing Line Hose 8 10 MPN 7013522
Ames 4000SS 5000SS Backflow Preventer RV Sensing Line Hose 8 10 MPN 7013522
$141.00
Ames 2000SS 3000SS Backflow Preventer 1ST Check Kit 2 1 2 4 MPN 7010097
Ames 2000SS 3000SS Backflow Preventer 1ST Check Kit 2 1 2 4 MPN 7010097
$220.00
Ames 2 3000SS Backflow Preventer 1ST CK Assembly Repair Kit 6 MPN 7010098
Ames 2 3000SS Backflow Preventer 1ST CK Assembly Repair Kit 6 MPN 7010098
$236.00
Watts 1 2 inch 9DS M3 sweat backflow preventer with atmospheric vent
Watts 1 2 inch 9DS M3 sweat backflow preventer with atmospheric vent
$42.95
NEW IN BOX WATTS NO8A 3 4 HOSE CONNECTION VACUUM BREAKER BACK FLOW PREVENTER
NEW IN BOX WATTS NO8A 3 4 HOSE CONNECTION VACUUM BREAKER BACK FLOW PREVENTER
$21.85
Wilkins 375 Backflow Preventer CK 2 Assembly 4 MPN 3509 300B
Wilkins 375 Backflow Preventer CK 2 Assembly 4 MPN 3509 300B
$285.00
APOLLO CONBRACO 40104A2 3 4 BACKFLOW PREVENTER BRASS BALL VALVE Q6751 DCV
APOLLO CONBRACO 40104A2 3 4 BACKFLOW PREVENTER BRASS BALL VALVE Q6751 DCV
$197.01
Watts Regulator 909 Reduced Pressure Backflow Preventer Size 4 Max Psi 175
Watts Regulator 909 Reduced Pressure Backflow Preventer Size 4 Max Psi 175
$759.99
Watts Backflow Preventer Repair Kit For Use With Mfr No 21 2 909 NRS 3 909
Watts Backflow Preventer Repair Kit For Use With Mfr No 21 2 909 NRS 3 909
$231.09
Watts Backflow Preventer Repair Kit For Use With Watts No 21 2 757 OSY 3 757
Watts Backflow Preventer Repair Kit For Use With Watts No 21 2 757 OSY 3 757
$43.04
WATTS 1 1 2 X 1 1 2 REDUCED PRESSURE ZONE BACKFLOW PREVENTER ASSEMBLY 009M2QT
WATTS 1 1 2 X 1 1 2 REDUCED PRESSURE ZONE BACKFLOW PREVENTER ASSEMBLY 009M2QT
$299.00
WATTS 1 1 4 X 1 1 4 REDUCED PRESSURE ZONE BACKFLOW PREVENTER ASSEMBLY 009M2QT
WATTS 1 1 4 X 1 1 4 REDUCED PRESSURE ZONE BACKFLOW PREVENTER ASSEMBLY 009M2QT
$299.00
BRAND NEW Apollo 40 4A4 4AMC 3 4 Back Flow Preventer
BRAND NEW Apollo 40 4A4 4AMC 3 4 Back Flow Preventer
$45.00
Matco Norca 646AS4LF Back Flow Preventer Brass Finish
Matco Norca 646AS4LF Back Flow Preventer Brass Finish
$25.00
WATTS 909 M1QT RP 1 1 2 BRONZE REDUCED PRESSURE BACKFLOW PREVENTER
WATTS 909 M1QT RP 1 1 2 BRONZE REDUCED PRESSURE BACKFLOW PREVENTER
$249.99
Watts Fluid Air 8A Back Siphonage Backflow Preventer
Watts Fluid Air 8A Back Siphonage Backflow Preventer
$56.77
Watts Fluid Air 8A Back Siphonage Backflow Preventer Pack of 5 Used
Watts Fluid Air 8A Back Siphonage Backflow Preventer Pack of 5 Used
$36.77
Watts 774DCDA 4 Double Backflow Check Valve Detector Preventer WE SHIP
Watts 774DCDA 4 Double Backflow Check Valve Detector Preventer WE SHIP
$319.99
Wilkins RK 014 Backflow Preventer Rubber Repair Kit Model 575  550
Wilkins RK 014 Backflow Preventer Rubber Repair Kit Model 575 550
$32.00
Apollo 3R 180 01 Backflow Preventer 120 PSI USED
Apollo 3R 180 01 Backflow Preventer 120 PSI USED
$99.99
Watts Fluid Air 0061913 Backflow Preventer 3 8 9BD NPTM for Carbon Dioxide Gas
Watts Fluid Air 0061913 Backflow Preventer 3 8 9BD NPTM for Carbon Dioxide Gas
$119.99
Zurn RK34 975XL Wilkins Backflow Preventer Repair Kit
Zurn RK34 975XL Wilkins Backflow Preventer Repair Kit
$38.24
WATTS  3 4 REDUCED PRESSURE BACKFLOW PREVENTER NIB  009 QT M2
WATTS 3 4 REDUCED PRESSURE BACKFLOW PREVENTER NIB 009 QT M2
$299.99
WATTS  3 8 BACKFLOW PREVENTER NIB 0061913  9BD NPTM
WATTS 3 8 BACKFLOW PREVENTER NIB 0061913 9BD NPTM
$185.99
WATTS  BACKFLOW PREVENTER NIB  PBD
WATTS BACKFLOW PREVENTER NIB PBD
$115.99
WATTS REGULATOR MODEL 7U2 2 DUAL CHECK BACKFLOW PREVENTER UNUSED 1116
WATTS REGULATOR MODEL 7U2 2 DUAL CHECK BACKFLOW PREVENTER UNUSED 1116
$40.00
WATTS 0061888 BACKFLOW PREVENTER 3 4 NEW
WATTS 0061888 BACKFLOW PREVENTER 3 4 NEW
$45.00
New WATTS Cu7 U2 U2 3 4x3 4 Backflow Preventer 0064041 Body Dual check valve
New WATTS Cu7 U2 U2 3 4x3 4 Backflow Preventer 0064041 Body Dual check valve
$32.67
BACK FLOW PREVENTER SS316 6000 PSI 1 2 NPT 121101 X IVI
BACK FLOW PREVENTER SS316 6000 PSI 1 2 NPT 121101 X IVI
$23.99

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