Waterway 400-5990 pump union assembly, 2.5 in. by 2 in., for Executive pumpsWaterway 2.5" x 2" Pump Union Assembly, 400-5990 In stock$1299
Waterway 400-5990 pump union assembly, 2.5 in. by 2 in., for Executive pumps
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Waterway 2.5" x 2" Pump Union Assembly, 400-5990

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$1299
In stock
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Quick overview

  • Waterway part 400-5990 The Executive pump union assembly, sold as an assembly rather than loose pieces.
  • Sized 2.5 in. by 2 in. The 2.5 in. side meets the pump, the 2 in. side takes the plumbing.
  • Executive pumps Listed for Waterway Executive 48 frame and 56 frame pumps.
  • Serviceable connection Unions are what let you pull a pump for service without cutting pipe.
  • Where leaks start A weeping union is usually a hardened o-ring or an overtightened nut, and both end in a replacement.
  • Hand tight Union nuts are designed to seal by hand, and a wrench is what cracks them.
Full description and specifications ↓

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Product details

The Waterway 400-5990 is the 2.5 in. by 2 in. pump union assembly for Waterway Executive pumps, in both the 48 frame and 56 frame versions.

What a union does

Unions are the reason a pump can be pulled off the pad in a few minutes instead of a few hours. Each one gives a threaded, sealed joint that comes apart by hand, so the pump can be removed for service or replacement without cutting into rigid pipe and rebuilding the plumbing afterward.

The usual failure

Unions leak in two ways. The o-ring hardens with age and heat until it no longer seals, or the nut has been cranked down with a wrench and cracked. Both are common, and both end with a replacement union. When you fit this one, thread the nut down by hand only; the joint is designed to seal on the o-ring, not on torque.

From Pool School

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Specifications
Brand Waterway
Manufacturer part number 400-5990
UPC 806105082145
Type Pump union assembly
Size 2.5" x 2"
Fits Waterway Executive 48 frame and 56 frame pumps
Part type Pool pump part
Shipping weight 0.2 lb
Ships Parcel

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Questions and answers

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

What size is this union?
2.5 in. by 2 in.
Which pumps does it fit?
Waterway Executive pumps, both the 48 frame and the 56 frame versions.
Is the o-ring included?
It is supplied as a union assembly. Check the parts you receive against what you are replacing before you start plumbing.
Should I tighten the union nut with a wrench?
No. Union nuts on pool pumps are made to seal hand tight against the o-ring. Using a wrench distorts the seat and cracks the nut, which is a common cause of the leak people were trying to fix.
Ask your own question