Used on the following Raypak heater models:

• Raypak 55A (5/1/87-9/30/89) & 55B (10/1/89-pres) Heaters
• Raypak 53A & 53B Model Spa-Pak Heater
• Raypak Versa 105A Bronze & Cast Iron Heater (10/91-5/99)
• Raypak 151 Model CAL III & Spa Pak (Mfg 1974-12/01/81)
• Raypak Versa 153 (12/1/81-1/1/84) & 153A (1/1/84-2/15/87)
• Raypak Versa 155A/155B/155C Heaters
• Raypak Gemini & Spa Pak 183A, 263A, 333A, 403A Heaters
• Raypak Gemini & Spa Pak 185A,B,B/C - 405A,B,B/C Heaters
• Raypak Versa R185,265,335,405 (11-01-93 thru 11-01-98)
• Raypak RP2100 Digital 185 - 405 Model Heaters (11-01-98 +)
• Raypak 206A, 266A, 336A, 406A Digital,Atmospheric Gas Heater     
• Raypak RP2100 Digital Gas Models R185A, R265A, R335A, R405A
• Raypak RP2100 Digital Gas Models R185B, R265B, R335B, R405B