SIAMP Skipper / Storm — Flush Valve Diaphragm Seal (Washer)
Replacement diaphragm seal (washer) for SIAMP flush valves. Refreshes the sealing face inside the valve to help cure constant running and weak or incomplete flushes.
- Skipper 45 dual-flush valves
- Storm 33A single-flush valves
- Storm 22A single-flush valves
Please compare dimensions and profile before ordering — valve revisions exist.
Key features
- Restores the internal seal of SIAMP Skipper / Storm flush valves
- Helps prevent post-flush water run-on
- Quick, low-cost service fix — no need to replace the whole valve in most cases
- Washer only (no valve or button included)
Approximate dimensions
- Outer diameter (OD): 71 mm
- Inner diameter (ID): 23 mm
- Material: Elastomer diaphragm (black)
Measurements are guide values taken from service stock; allow for typical manufacturing tolerances.
Symptoms it solves
- Toilet keeps filling/running after a flush
- Weak, incomplete or slow flush
- Intermittent seal after long service
Fitting overview
- Isolate water and empty the cistern.
- Release the valve body (bayonet/clip), lift out and access the diaphragm seat.
- Swap the old diaphragm for the new one, ensuring the correct orientation and clean sealing faces.
- Refit, turn on water and test for a crisp shut-off.
If the valve base is leaking at the cistern outlet, renew the outlet/base seal (separate part) — this diaphragm addresses the internal valve seal only.
Technical summary
| Family | SIAMP Skipper / Storm |
| Component | Diaphragm seal (flush valve washer) |
| Approx OD × ID | ~71 mm × ~23 mm |
| Finish/Colour | Black elastomer |
| Pack contents | 1 × diaphragm seal (washer) |
FAQs
Is this the same as the outlet/base seal?
No — this is the internal diaphragm inside the valve body. The outlet/base seal sits between the cistern and pan and is a separate item.
Will it fit every SIAMP valve?
It is commonly used on Skipper 45, Storm 33A and Storm 22A. Compare the profile and dimensions before purchase.
Do I need tools?
Standard hand tools are usually sufficient. Always isolate the water first and follow safe working practices.
