Aquascape 29099 Check Valve Assembly for AquaSurge, AquascapePRO, and Tsurumi Pumps Connects pump to pond plumbing Helps prevent water from flowing back through the pump Specially-designed collar allows for easy disconnect For use with Pondless Waterfall Vault and Large Snorkel filters; Tsurumi 3PL, 5PL, 9PL, and 8PN pumps; all AquaSurge pumps; AquascapePRO 3000, 4500, and 7500 pumps Durable construction ensures years of trouble-free use