Waterway 400-5670 pump union assembly with o-ring, 2 in. nut by 2 in. slipWaterway Pump Union Assembly with O-Ring, 2" Nut x 2" Slip, 400-5670 In stock$1199
Waterway 400-5670 pump union assembly with o-ring, 2 in. nut by 2 in. slip
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Waterway Pump Union Assembly with O-Ring, 2" Nut x 2" Slip, 400-5670

Ask a questionMPN 400-5670
$1199
In stock
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Quick overview

  • Genuine Waterway part Factory part number 400-5670.
  • 2 in. nut by 2 in. slip The nut side threads onto the pump port, the slip side is solvent welded to 2 in. pipe.
  • O-ring included The seal comes with the assembly, so the union arrives ready to make up.
  • The point of a union It is what lets a pump be unbolted and lifted out for service without a saw and a repipe.
  • A common leak point Unions weep when the o-ring has taken a set or the nut has been cross threaded, and both are worth checking before blaming the pump.
  • Hand tight is the rule Union nuts seal on the o-ring, not on thread torque, so wrenching one down usually splits the nut instead of stopping the leak.
Full description and specifications ↓

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Product details

The Waterway 400-5670 is a pump union assembly with o-ring, 2 in. union nut on one side and 2 in. slip socket on the other. It is the genuine Waterway part.

Why a union is there

A union is the joint that lets equipment come out of a plumbing run. The nut side threads onto the pump port and the slip side is cemented to the pipe, so when the pump has to come out for service or replacement, the nut backs off by hand and the pump lifts away. Without one, that same job means cutting pipe and repiping afterwards.

When to replace it

Unions leak for two reasons. Either the o-ring has taken a set and no longer fills the seat, or the nut has been cross threaded or cracked, usually by someone reaching for a wrench. The o-ring is the first thing to check. If the nut or the seating face is damaged, the whole assembly needs to go.

Making it up

Seat the o-ring clean and dry of grit, then run the nut down by hand until it is snug. That is as far as it needs to go. If it still weeps at hand tight, the o-ring or the seat is the problem, and more force will only crack the plastic.

Specifications
Brand Waterway
Manufacturer part number 400-5670
UPC 806105082053
Type Pump union assembly
Configuration 2" nut x 2" slip
Included O-ring
Part type Pool pump part
Shipping weight 0.1 lb
Ships Parcel

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Questions and answers

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

Does the o-ring come with it?
Yes. The union assembly is supplied with its o-ring.
What are the two ends?
A 2 in. union nut on one side, which threads onto the pump port, and a 2 in. slip socket on the other, which is solvent welded to 2 in. pipe.
My union drips, do I need the whole assembly?
Not always. Start by taking the nut off and looking at the o-ring. If it is flat, cracked or has debris in the seat, the seal alone may be the problem. Replace the assembly when the nut or the seat itself is cracked or cross threaded.
How tight should the nut be?
Hand tight. The seal is made by the o-ring compressing, not by thread force. Using a wrench on a plastic union nut is the fastest way to crack it.
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