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:

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 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
Watts 1LF009M2QT Reduced Pressure Zone Backflow Preventer
Watts 1LF009M2QT Reduced Pressure Zone Backflow Preventer
$275.00
WATTS REGULATOR BACKFLOW PREVENTER VALVE SIZE 2 1 2 NUMBER 900
WATTS REGULATOR BACKFLOW PREVENTER VALVE SIZE 2 1 2 NUMBER 900
$499.99
BRAND NEW Apollo 40 4A4 4AMC 3 4 Back Flow Preventer
BRAND NEW Apollo 40 4A4 4AMC 3 4 Back Flow Preventer
$45.00
Wilkins 1 375 Backflow Preventer 1 375 RPZ Reduced Pressure Principle Assembly
Wilkins 1 375 Backflow Preventer 1 375 RPZ Reduced Pressure Principle Assembly
$150.00
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 No8 Back Siphonage Back Flow Preventer
Watts No8 Back Siphonage Back Flow Preventer
$11.99
Watts No8A Back Siphonage Back Flow Preventer
Watts No8A Back Siphonage Back Flow Preventer
$24.99
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
Watts Fluid Air 8A Back Siphonage Backflow Preventer Pack of 5
$36.77
2 INCH BACKFLOW PREVENTER APOLLO CONBRACO 40208T2 2 IN BARELY USED
2 INCH BACKFLOW PREVENTER APOLLO CONBRACO 40208T2 2 IN BARELY USED
$249.00
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
Watts No8A Back Siphonage Back Flow Preventer Non Removable  FREE SHIPPING
Watts No8A Back Siphonage Back Flow Preventer Non Removable FREE SHIPPING
$19.99
WATTS  3 4 REDUCED PRESSURE BACKFLOW PREVENTER NIB  009 QT M2 PZB
WATTS 3 4 REDUCED PRESSURE BACKFLOW PREVENTER NIB 009 QT M2 PZB
$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 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
$31.15
Watts 115 1115 ACV Backflow Preventer Rubber Repair Kit 4 MPN 3302 01
Watts 115 1115 ACV Backflow Preventer Rubber Repair Kit 4 MPN 3302 01
$145.25
APOLLO CONBRACO 40104A2 3 4 BACKFLOW PREVENTER BRASS BALL VALVE Q6751 DCV
APOLLO CONBRACO 40104A2 3 4 BACKFLOW PREVENTER BRASS BALL VALVE Q6751 DCV
$197.00
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
WATTS  1 4 BACKFLOW PREVENTER NIB EDP 0061911  9BD NPTM
WATTS 1 4 BACKFLOW PREVENTER NIB EDP 0061911 9BD NPTM
$185.00
NIB WATTS RK 909 CK2 6 BACKFLOW PREVENTER SECOUND CHECK VALVE KIT 6 0887217
NIB WATTS RK 909 CK2 6 BACKFLOW PREVENTER SECOUND CHECK VALVE KIT 6 0887217
$950.00
WATTS 3 8 LF7 DUAL CHECK VALVE BACKFLOW PREVENTER 3 8 FNPT NEW
WATTS 3 8 LF7 DUAL CHECK VALVE BACKFLOW PREVENTER 3 8 FNPT NEW
$149.95
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
$94.95
Apollo DCA4A F34 3 4 Backflow Preventer Double Check Valve 4A 104 A2F NIB
Apollo DCA4A F34 3 4 Backflow Preventer Double Check Valve 4A 104 A2F NIB
$99.99
1 Nib Watts 9D M2 Backflow Preventer 3 4 Inch 9DM2 175 Psi
1 Nib Watts 9D M2 Backflow Preventer 3 4 Inch 9DM2 175 Psi
$49.99
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
$129.99
Watts Fluid Air 0061911 Backflow Preventer 1 4 9BD NPTM
Watts Fluid Air 0061911 Backflow Preventer 1 4 9BD NPTM
$210.77
Febco 3 4 LF860 QT RP Lead Free Reduced Pressure Backflow Preventer
Febco 3 4 LF860 QT RP Lead Free Reduced Pressure Backflow Preventer
$243.23
Watts 3 4 1 Total Repair Kit 909 Series Backflow Preventers 794066 SKID96
Watts 3 4 1 Total Repair Kit 909 Series Backflow Preventers 794066 SKID96
$129.00
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

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