The HUNTER HC50F50M Sprinkler Check Valve is an economical water-saving valve that eliminates low head drainage for sprinklers located on slopes and can handle elevation extremes up to 9.8m. 

Easy adjustment access from top of valve
Maximum flexibility with the ability to adjust & compensate for elevational changes up to 9.8m
Variety of inlet & outlet options reduces the need for additional fittings
Constructed to schedule 80 specifications, making it more durable & long-lasting than ever

Hunter Industries is a global manufacturer of a full range of high-quality irrigation products from controllers, rotors, rotary sprinklers, spray head sprinklers, nozzles, valves, weather drips, and much more.
Pressure loss chart:

Product specifications:

Check Valve: ½in Female x ½in Male
Compensates for up to 9.8m of elevation change
Weight: 0.01kg
Dimensions [l x w]: 7.5 x 3cm
Body material: Corrosion- & UV-stable PVC
Spring material: Stainless steel