Magic Plastics UniBody 2-1/2" Union x 2-1/2" Slip Gate Valve (0516-25) mazzei A volute like this is

A volute like this is useful because it forms the chamber around the impeller and directs water through the pump

or maintenance of the feed rate mechanism

AquaStar generic white lower body for compatible Hayward-style cleaners

25 ounce format using the 0013675 reference

Magic Plastics UniBody 2-1/2" Union x 2-1/2" Slip Gate Valve (0516-25) mazzei A volute like this isMagic Plastics UniBody 2 1 2" Union x 2 1 2" Slip Gate Valve (0516 25) is a replacement plumbing component for compatible pool, spa, bath, or equipment systems. It is designed to help connect, route, seal, or service water flow through the surrounding plumbing assembly while matching the size and configuration required by the original installation. Use this part when replacing a cracked, leaking, stripped, worn, or damaged fitting, valve, manifold, or