Harwil
Harwil Flow Switch (Probe Only) Long | Hot Tub Replacement Part
Harwil Flow Switch (Probe Only) Long | Hot Tub Replacement Part
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The Harwil Flow Switch (Probe Only) Long is a genuine replacement flow switch commonly fitted to UK hot tubs such as Beachcomber and similar models. This probe-style switch is designed to sit within a clear section of pipework, detecting water flow and helping protect your heater from running when flow is inadequate.
- 1/2 inch MPT connection (outer thread diameter approximately 3/4 inch)
- Length: 90mm; Plastic arm length: 46mm (1-7/8 inch); Outer thread diameter: 20mm
- Long probe design intended for fitting into clear pipework sections
- Directional flow arrow marked on the side for correct installation
- Common, well-documented replacement for popular UK hot tub brands including Beachcomber
- Genuine Harwil build quality for dependable, long-term operation
- Clear installation guidance via the directional flow arrow reduces fitting errors
- Protects your heater by detecting inadequate water flow before damage occurs
| Brand | Harwil |
| Product Type | Flow Switch |
| Connection | 1/2 inch MPT (outer thread ~3/4 inch) |
| Length | 90 mm |
| Plastic arm length | 46 mm (1-7/8 inch) |
| Outer thread diameter | 20 mm |
| Common fitment | Beachcomber and similar UK hot tubs |
Fit this switch into a clear section of pipework, ensuring the arrow on the side points in the direction of water flow. The thread must be wound all the way in for correct operation. Note that this part will not fit inside the clear plastic tee also found in this pipework section. Installation should be carried out by someone familiar with hot tub plumbing.
Harwil is a well-established manufacturer of flow switches used across many major hot tub brands, and this probe-style switch is the version most commonly found in UK installations. It's a genuine, purpose-matched replacement rather than a generic aftermarket part.
- Check the probe periodically for scale or debris build-up that could affect operation
- Confirm the flow direction arrow remains correctly aligned after any plumbing work
- Ensure the thread stays fully wound in to maintain a proper seal
- Have the switch and surrounding plumbing inspected if flow faults persist after replacement
For delivery timelines and options, see our Shipping & Delivery page. If you need to return or exchange this item, details are available on our Returns & Refund Policy page.