Waterway 400-9280 pump union assembly with hose adapter and o-ringWaterway Pump Union Assembly, 1.5" x 1.25" Hose Adapter, 400-9280 In stock$1599
Waterway 400-9280 pump union assembly with hose adapter and o-ring
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Waterway Pump Union Assembly, 1.5" x 1.25" Hose Adapter, 400-9280

Ask a questionMPN 400-9280
$1599
In stock
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Quick overview

  • Union, not glue A union lets the pump come off for service without a saw and a pile of couplings.
  • Hose adapter included Supplied with the hose adapter rather than as a bare nut.
  • O-ring included The sealing o-ring comes with the assembly, which is what actually makes the joint tight.
  • Waterway 400-9280 Ordered by part number so the thread and the adapter match.
  • Check your sizes The listing carries both a 1.5" x 1.25" hose adapter description and a 2-1/2" union nut description, so measure before ordering.
  • Common service part Union o-rings and nuts are among the first things to leak on a spa or pool pump.
Full description and specifications ↓

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Product details

The Waterway 400-9280 is a pump union assembly supplied with a hose adapter and an o-ring. It is the fitting that lets a pump be taken off without cutting into the plumbing.

Why unions earn their place

A pump gets pulled more often than anything else at the equipment pad: seals, impellers, motors, replacements. If it is glued in, every one of those jobs starts with a saw and ends with new couplings and a wait for the cement to set. A union unscrews by hand and the pump lifts straight out.

Sizing, read this first

The source information for this part is not consistent. The product title describes it as a 1.5 inch by 1.25 inch hose adapter, the longer description calls it a 2-1/2 inch union nut with a 1-1/2 inch or 1-1/4 inch hose adapter and an o-ring, and the size attribute reads 1-1/4 inch. Measure the union you are replacing, or tell us the pump model, before you order.

The o-ring

It is included. It is also the part that usually fails first, so if a union is weeping rather than cracked, start there before replacing the whole assembly.

From Pool School

How to Prime a Pool PumpFrom the breaker to a full pot, each manufacturer's time limit, and what to check when it won't catch prime. Read Replace the Pool Pump Motor or the Whole Pump?The manufacturers' tests first, what each repair replaces, and the federal motor rule. Read
Specifications
Brand Waterway
Manufacturer part number 400-9280
UPC 806105078261
Type Pump union assembly
Fitting type Union
Listed size 1-1/4"
Title description 1.5" x 1.25" hose adapter
Alternate description 2-1/2" union nut with 1-1/2" / 1-1/4" hose adapter and o-ring
Included Union nut, hose adapter, o-ring
Shipping weight 0.5 lb
Ships Parcel

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Questions and answers

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

What sizes does this cover?
The source is not consistent. The product title describes a 1.5" x 1.25" hose adapter, while the longer description calls it a 2-1/2" union nut with a 1-1/2" or 1-1/4" hose adapter, and the size attribute reads 1-1/4". Measure your existing union and adapter before ordering, or contact us with the pump model.
Does it come with the o-ring?
Yes. The o-ring is part of the assembly.
Why use a union at all?
So the pump can be removed. Glued fittings mean cutting pipe every time the pump comes off for a seal, an impeller or a replacement, while a union unscrews by hand.
My union is dripping. Do I need the whole assembly?
Not always. A drip is often just the o-ring, and it is worth trying that first. Replace the whole assembly when the nut is cracked, cross threaded or the adapter itself is damaged.
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