Pentair | 474974 | MasterTemp 125 and Max-E-Therm 1.5 Inch Union Kit

The Pentair 474974 Union Kit is a replacement water connection component designed for compatible MasterTemp 125 and Max-E-Therm pool and spa heater applications. This 1.5 inch union kit helps create a secure, serviceable plumbing connection at the heater water system, supporting proper flow, dependable sealing, and easier maintenance during installation or repair.

Key Features

• Replacement union kit is designed for use with compatible Pentair MasterTemp 125 and Sta-Rite Max-E-Therm heater systems.
• 1.5 inch connection size supports heater plumbing configurations that use the matching union fitting format.
• This kit helps create a secure water connection point between the heater and the connected plumbing line.
• Union-style design allows easier heater service and removal without cutting or rebuilding surrounding plumbing.
• Intended for maintenance and repair when the original union components become cracked, worn, damaged, or begin to leak.
• OEM replacement design helps maintain fit and function within the original heater water connection layout.
• Proper union and seal condition is important to dependable water flow and leak-resistant heater operation.
• Kit format provides a more complete replacement solution for the heater connection point rather than replacing individual pieces only.

Product Overview

The Pentair 474974 Union Kit is a service replacement part used in the water connection assembly of compatible MasterTemp 125 and Max-E-Therm heaters. Its primary role is to provide a secure and removable 1.5 inch plumbing connection so water can move through the heater correctly during normal operation. Because heater plumbing connections are exposed to water pressure, temperature changes, and routine service work, the union assembly plays an important role in maintaining dependable flow and sealing performance.

This kit is well suited for repair situations where the heater remains otherwise serviceable but the original union connection has become worn, damaged, or no longer seals correctly. The union-style format also makes future maintenance easier by allowing the heater to be disconnected more cleanly when service is needed. For pool and spa service professionals maintaining compatible MasterTemp 125 and Max-E-Therm heaters, the 474974 fills an important role in restoring proper water connection integrity and dependable heater operation.