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:

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
2 INCH BACKFLOW PREVENTER APOLLO CONBRACO 40208T2 2 IN BARELY USED
2 INCH BACKFLOW PREVENTER APOLLO CONBRACO 40208T2 2 IN BARELY USED
$250.00
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
$10.24
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
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
1 double check valve backflow preventer
1 double check valve backflow preventer
$60.00
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
$21.25
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 Used
Watts Fluid Air 8A Back Siphonage Backflow Preventer Pack of 5 Used
$36.77
Wilkins RK 014 Backflow Preventer Rubber Repair Kit Model 575  550
Wilkins RK 014 Backflow Preventer Rubber Repair Kit Model 575 550
$27.20
Apollo 3R 180 01 Backflow Preventer 120 PSI USED
Apollo 3R 180 01 Backflow Preventer 120 PSI USED
$99.99
Watts N9 backflow preventer cdual check vacuum breaker
Watts N9 backflow preventer cdual check vacuum breaker
$26.00
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  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
CONBRACO 2 125 S 400 WOG CHECK VALVE BACK FLOW PREVENTER NOS
CONBRACO 2 125 S 400 WOG CHECK VALVE BACK FLOW PREVENTER NOS
$40.00
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
LFRK 909 RT 3 4 1 Total Rubber Parts Repair Kit for Watts 909 Backflow Preventer
LFRK 909 RT 3 4 1 Total Rubber Parts Repair Kit for Watts 909 Backflow Preventer
$34.55
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
$37.99
NEW WATTS 3 4 909QT RPZ REDUCED PRESUURE ZONE BACKFLOW PREVENTER VALVE ASSEMBLY
NEW WATTS 3 4 909QT RPZ REDUCED PRESUURE ZONE BACKFLOW PREVENTER VALVE ASSEMBLY
$285.00
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  0061894 BACKFLOW PREVENTER NIB  9BD
WATTS 0061894 BACKFLOW PREVENTER NIB 9BD
$87.55
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 Regulator 8A Siphonage 3 4 Backflow Preventer
Watts Regulator 8A Siphonage 3 4 Backflow Preventer
$6.99
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
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
AMES FIRE SPRINKLER SYSTEM BACKFLOW PREVENTER SIZE 4
AMES FIRE SPRINKLER SYSTEM BACKFLOW PREVENTER SIZE 4
$1,795.00

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