Waterway 711-6020 2.5 inch heater union gasketWaterway 2.5" Heater Union Gasket, 711-6020 In stock$599
Waterway 711-6020 2.5 inch heater union gasket
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Waterway 2.5" Heater Union Gasket, 711-6020

Ask a questionMPN 711-6020
$599
In stock
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Quick overview

  • Genuine Waterway Factory gasket 711-6020, cut to the dimensions the union was designed for.
  • For the 2.5 inch union Sized to the 2.5 inch heater union, not the smaller 2 inch fitting.
  • Seals the heater connection Sits between the union halves so tightening the nut makes a watertight joint.
  • The usual cause of a dripping union A flattened or hardened gasket keeps weeping no matter how hard the nut is turned.
  • No tools needed The union nut backs off by hand or with a strap wrench, and the gasket lifts straight out.
  • Worth stocking A cheap part that saves a service call when a heater is opened up or reinstalled.
Full description and specifications ↓

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Product details

This is the genuine Waterway 711-6020 gasket for the 2.5 inch heater union. It is the flat seal that sits between the two halves of the union, and it is what actually makes the joint watertight when the nut is tightened.

Why a union leaks

A union does not seal on its threads. The nut simply pulls the two faces together and squeezes the gasket between them. That gasket spends its life compressed, warm and wet, and over a few seasons it hardens and takes the shape it was squeezed into. When that happens it can no longer close the gap, and the joint drips. Tightening harder is the natural response and the wrong one, because it distorts the nut and the seating face without improving the seal.

Fitting

Drain the line, back the union nut off, and lift the old gasket out of its seat. Clean any grit or old debris off both faces, drop the new gasket in flat, and tighten the nut by hand. Do not add tape or thread paste, which belongs on threaded pipe joints and not on a union.

Before you order

Check the size. This is the 2.5 inch gasket, and a 2 inch union takes a different part.

Specifications
Brand Waterway
Manufacturer part number 711-6020
UPC 806105124906
Type Union gasket
Size 2.5 inch
Application Heater union
Ships Parcel

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Questions and answers

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

Which union does this fit?
The 2.5 inch heater union. A 2 inch union takes a different gasket, so measure the union before ordering.
My union drips even when I tighten it hard. Will this fix it?
Usually. Once a union gasket has taken a set or gone hard, extra torque only distorts the nut and the seat. A fresh gasket seals with normal hand tightening.
Do I need thread sealant or tape?
No. A union seals on the gasket face, not on the threads. Adding tape or paste to a union thread makes it harder to tighten evenly and does nothing for the seal.
Should I replace both unions?
If the heater has a union at each end and they are the same age, changing both while the system is drained down saves opening it up again shortly afterwards.
Ask your own question