The Waterway Super Hi-Flo Suction Assembly, part 640-3781V, is a high-flow suction fitting designed for spa and hot tub plumbing systems. It provides a large suction opening that maximizes water circulation into the filtration and pump system, helping to maintain strong flow while meeting safety standards.

Specifications:

• Brand: Waterway Plastics
• High-flow suction design — 5" diameter cover with large internal opening for efficient water intake
• 2" straight nut connection for 2" plumbing systems
• VGB-compliant cover — helps meet suction safety requirements in many spa installations
• Durable, corrosion-resistant black finish
• Part no. 640-3781V

Returns & installation: Confirm your spa's suction hole diameter and plumbing size (2") match before ordering, as plumbing parts are non-returnable once installed.

FAQ

Q: How do I know if this fitting needs replacing?
A: A cracked, discolored, or loose-fitting suction cover, or reduced water flow, are common signs of a failing suction assembly.

Q: Is this fitting VGB compliant?
A: Yes — the larger suction face is designed to help meet suction entrapment safety standards used in many spa installations.