Hurlcon Astralpool Temperature Sensor (thermistor) Brass Well 1/8" BSP thread. Suits all Hurlcon / Astralpool heaters with Digital Thermostat. Also suits Jacuzzi J-HN250C & J-HN400C heaters.

Sensor housing brass well also suits Onga, Dega (De-gas) heaters. 

Where thread has been stripped in plastic hole, you may need to increase it to 1/4" BSP and use an adapter. 

For full list of Hurlcon Astralpool gas heater spare parts, see here:
- HX / WX Series
- MX Series
- JX Series
- Viron Series
- HiNRG Series

- ICI Gas Heaters

Use Pink Thread Tape for Sealing Listed Here

NEW - Service Pack for all MX, HX, HiNRG, Viron Gas Heaters
Servicing a Hurlcon or Astral pool or spa heater? This is a pack of minimum parts needed for a 3 year service. Save $$$. 
Comes with parts that should be replaced every 3 years on a general Service. Click Here --> Astral Pool & Hurlcon Heater Service Packs