HSI Pilot Igniter / Ignitor w/ Flame Sensor. Suits Raypak 200-430 / Hurlcon / Astralpool MX 125 through MX 400 gas heaters with a  gas valve. Suits all Hurlcon / Astral pool MX series heaters (except MX 500). May also suit Brivis Buffalo & Wombat models. Has Hot Surface Ignitor (HSI), Pilot, and Flame Sensor. Comes with tube nut and olive.

Suits Raypak, Davey gas heaters with a . Has built-in Hot Surface Ignitor (HSI), Pilot, and Flame Sensor. Comes with tube nut and olive. Comes with Natural gas nozzle, but if using LPG, make sure old nozzle is swapped into the new HSI assembly.

Other parts that go with this:

Hurlcon / Astralpool: 

• Suits: MX 125, MX 150, MX 200, MX 250, MX 300, MX 350, MX 400, WWDG 250-400. Part Number 73734.

Raypak: 

• Suits Raypak 200, 280, 350, 430 and RP2100 (above 180mJ) gas heaters w/ SmartValve

HWQ3450C1169, B012918, 73734, 56609199, B012918