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.

• Super Hi‑Flo Suction Assembly 5" – 640‑3781V
• High‑Flow Suction Design — Features a 5" diameter cover and large internal opening to support efficient water intake and circulation.
• 2" Straight Nut Connection — Designed to fit 2" plumbing systems with a straight nut fitting for secure installation.
• VGB Compliant Cover — Helps meet suction safety requirements in many spa installations by using a larger suction face.
• Durable Black Finish — Tough, corrosion‑resistant material built for the wet, chemically treated environment around spas.
• Wide Compatibility — Suitable for pools and spas that use a 5" suction assembly; always verify hole diameter and plumbing size before ordering.
• Part No.: 640‑3781V

Why choose this product?
This Super Hi‑Flo suction assembly enhances water intake capacity and circulation efficiency in your spa system. Replacing a worn or cracked suction fitting restores proper flow, helps reduce strain on the pump, and ensures safe and effective water movement through your spa’s filtration and pump plumbing.