Eliminate low-head drainage for both rotor and spray shrub systems with the adjustable Hunter HC50F50M 0.5" x 0.5" Female x Male HCV Check Valve. Easily adjust to the proper check height and insert this remarkable product in between the riser and sprinkler head. If you've ever used an HCV before, you know just how simple this is – it's the easiest to adjust drain check valve available and can handle elevation extremes up to 32 ft. However, what you probably don't know is that it is now constructed to schedule 80 specifications, making it more durable and long-lasting than ever.