Pentair 474974 MasterTemp 1-1/2 inch heater union kitPentair Union 1.5" Kit for MasterTemp 125, 474974 In stock$7099
Pentair 474974 MasterTemp 1-1/2 inch heater union kit
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Pentair Union 1.5" Kit for MasterTemp 125, 474974

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$7099
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Quick overview

  • Genuine Pentair Factory part 474974, the union kit specified for the MasterTemp 125 water system.
  • 1-1/2 inch Sized for the 1-1/2 inch plumbing on the Model 125 heater.
  • Max-E-Therm and MasterTemp Pentair lists this union kit for both heater families.
  • Kit, not a single piece Supplied as a union kit rather than a loose nut or tailpiece.
  • Serviceable connection Unions let the heater be isolated and pulled without cutting pipe.
  • Stops a leaking joint A cracked union or a flattened union O-ring is the usual reason a heater weeps at the plumbing.
Full description and specifications ↓

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Product details

Pentair 474974 is the 1-1/2 inch union kit for the MasterTemp Model 125 heater water system. Pentair lists it for Max-E-Therm and MasterTemp heaters, and it is the genuine factory part rather than a generic fitting.

What the union does

The unions are the joints that tie the heater into the pool plumbing. They are what lets a service tech break the heater loose and lift it out without cutting pipe, so they matter far beyond the few dollars of plastic involved. They are also a common leak point, because the seal is squeezed every time the union is opened and closed.

Before you order

This is the 1-1/2 inch kit, which is the size used on the Model 125. Larger MasterTemp models plumb in at a different size, so confirm what is on your heater before ordering.

Specifications
Brand Pentair
Manufacturer part number 474974
UPC 788379865290
Type Union kit
Size 1-1/2 inch
Fits Pentair Max-E-Therm and MasterTemp heaters
Model MasterTemp Model 125 heater water system
Shipping weight 0.45 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

Which heater is this union kit for?
Pentair lists 474974 for the MasterTemp Model 125 heater water system, and for Max-E-Therm and MasterTemp heaters generally.
What size is it?
1-1/2 inch. Check the plumbing at your heater before ordering, because larger MasterTemp models use a different size.
Is this a genuine Pentair part?
Yes. It is Pentair part number 474974.
Why would I need to replace a union?
Unions crack, strip or leak at the seal over time. Replacing the union restores a tight joint and keeps the heater serviceable without cutting the pipe.
Ask your own question