Water Hammer Hydra Arrestor — 25 mm (1″ BSP) — Large-House Capacity
Tame noisy water hammer from fast-closing valves (toilets, washers, dishwashers, mixers) with this Hydra water hammer arrestor. The large-volume chamber is sized for whole-house protection, 25 mm 1″ BSP connection, and simple in-line installation.
Key features
- Stops banging/thumping pipes caused by sudden valve closure
- Large-house capacity for multiple outlets & long runs
- 25 mm (1″ BSP) connection
- Easy to install — in line with the problem branch
- No maintenance design
- Lifetime guarantee
Size & format
- Connection: 25 mm (1″ BSP)
- Overall size (approx.): 12⅝″ L × 2⅛″ W (≈ 321 × 54 mm)
- Body: Large-volume water hammer chamber
- Orientation: Install vertically where practical (near fast-closing valve) or per manufacturer guidance
What’s included
- 1 × Water Hammer Hydra Arrestor — 25 mm (1″ BSP) Large-House capacity
- Fitting guidance (basic)
Adaptors, tees and isolation valves supplied separately.
Sizing guide — typical “unit” loads
This Large-House arrestor supports a total capacity of ~114–154 units. Add up expected simultaneous loads:
| Device | Hot | Cold |
|---|---|---|
| Shower | 2 | 1 |
| Bath | 1.5 | 1.5 |
| WC (fill valve) | – | 2 |
| Basin / Sink | 1.5 | 1.5 |
| Dishwasher | – | 3 |
| Washing Machine | – | 3 |
| Garden Tap | – | 2 |
If hammer occurs on both hot and cold services, install an arrestor on each line.
Check before you buy
- Connection required is 25 mm (1″ BSP) or you have suitable adaptors
- Hammer is caused by fast-closing valves (fill valves, solenoids, mixer taps)
- Fit on both hot & cold if both lines are affected
- You have room for the unit (321 × 54 mm) near the problem branch
FAQs
Where should I install it?
As close as practical to the source of hammer (e.g. WC fill valve, washing machine, dishwasher), on the branch line feeding the device. For whole-house issues, fit on the main distribution line per sizing.
Do I need one on hot and cold?
If hammer occurs on both circuits, yes — fit an arrestor on each line.
Will it restrict flow?
No — the chamber absorbs pressure shock; it is not a flow restrictor.
Is maintenance required?
No routine maintenance is required. Periodically check joints for leaks as part of normal plumbing safety.