Pentair 2" FBT x 2" Slip Pump Union, Qty 2 (PKG 188Z) bathpumps A check valve is useful

A check valve is useful because it helps prevent backflow

In the correct application

3A] (6315141) is engineered for air blower applications

or plumbing updates where matching Pentair components are needed

The PresAir Trol standard air button in chrome is designed for compatible 1-5/8 inch hole-size installations with a 2-5/8 inch face diameter

Pentair 2" FBT x 2" Slip Pump Union, Qty 2 (PKG 188Z) bathpumps A check valve is usefulPentair Pump Union, 2" Female Buttress Thread x 2" Slip, Quantity 2 (PKG 188Z) is a replacement union or union related fitting for compatible Pentair pool and spa plumbing applications. Unions make equipment easier to install, service, and remove while maintaining a secure plumbing connection. Use this part when a union, adapter, nut, or related connection is cracked, leaking, stripped, or being replaced during plumbing service. Confirm thread style,