Hunter 458556 PRS40-04CV, 06CV, 12CV Body Cap (Standard (Gray) w/Check Valve ID) - EvergreenSprinklers.com
Amazon.com: Hunter Pro Spray 4 inch Pop Up Sprinkler Head Body With Leak Free Drain Check Valve Included PSI 40 PROS04-PRS40-CV (4) : Patio, Lawn & Garden