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Guide 03 · The money question

The rebuild kit isn't cheap.
Your labour already cost more.

The $15 rebuild kit looks like the obvious choice next to a complete head. It usually isn't — because nobody puts the second rebuild, the wrench time, or the shift you're short a working station into that comparison.

Start here

First: is it actually broken?

Before running any cost comparison, read the descale guide. It takes twenty minutes and costs nothing, and it resolves the large majority of "this valve is failing" situations. Free fixes should always be attempted before either expensive option.

What a rebuild actually involves

A typical rebuild kit for this class of valve contains a handful of small parts — washers, seals, a bumper, sometimes a spring and retaining components. To fit them you will:

  1. Close the supply and relieve pressure
  2. Remove the head from the hose — sometimes with difficulty if it's been on for years
  3. Disassemble the body on a bench, keeping track of small parts in order
  4. Replace internals, ideally cleaning scale off every surface while you're in there
  5. Reassemble correctly — wrong order or a pinched seal means doing it twice
  6. Reinstall, open the supply, check for leaks at every joint

For someone who has done it before, in a quiet moment, that's realistically thirty to forty-five minutes. Done mid-service, at the sink, with people waiting for the station — considerably more, and considerably worse a decision.

Put the real numbers side by side

 RebuildReplace the head
Parts Rebuild kit, typically $15–25 Complete assembled head
Your time 30–45 minutes plus clean-up About one minute — unscrew, screw on
Tools Wrench, picks, a clean bench Nothing, or a strap wrench if it's seized
Downtime Station is out of service during the job Station is back in service immediately
Chance of a second attempt Real — pinched seal, mixed-up parts order, old rubber already marginal Minimal
What's still old afterwards The body, the handle, everything else Nothing
The line nobody does the maths on: the rebuild only fixes the parts in the kit. If you've done this once already in the past year, everything else in that unit has the same amount of wear on it, and you'll be back at the bench for a different failed component. That is the actual argument here — not that rebuilding is hard, but that the second rebuild is where it stops being cheaper.

The decision, made simple

Rebuild if…

  • This is the first failure on this unit
  • The body and handle are in good shape — no corrosion, no cracks
  • You have bench time available outside service
  • You know this specific unit and have done it before
  • The failure is one known part, and that part is in the kit

Replace if…

  • You have already rebuilt this unit once
  • The handle is loose, the trigger sticks, or the body is pitted
  • You're doing this during service, or on a Friday night
  • The unit is more than a couple of years old and gets heavy daily use
  • You need the station back now

How the maths actually lands

Take whatever you pay someone per hour. A forty-five minute rebuild at a bench, plus the risk of a second pass, plus another one likely inside a year — compare that against one purchase that puts the station back working in ninety seconds. The gap usually surprises people, because the part cost is the visible number and the labour is invisible.

If it's the second failure, the comparison is already over. Two rebuilds plus labour has typically exceeded the cost of replacing the head outright — and you still have the same worn body afterward.

Before you buy the replacement

One step, ninety seconds, and it's the difference between a head that fits and a return: check your thread. This is the step people skip, and it's why this category has so many "doesn't fit" complaints.

See the replacement head Check my thread first