This part fits: ALPHA BOILERS CD24C (SHORT PARTS LIST) ALPHA BOILERS CD24C (BOILER COMPLETE) ALPHA BOILERS CD24S (SHORT PARTS LIST) ALPHA BOILERS CD24S (BOILER COMPLETE) ALPHA BOILERS CD32C (SHORT PARTS LIST) ALPHA BOILERS CD32C (BOILER COMPLETE) ALPHA BOILERS CD13R (SHORT PARTS LIST) ALPHA BOILERS CD13R (BOILER COMPLETE) ALPHA BOILERS CD18R (SHORT PARTS LIST) ALPHA BOILERS CD18R (BOILER COMPLETE) ALPHA BOILERS CD24R (SHORT PARTS LIST) ALPHA BOILERS CD24R (BOILER COMPLETE) CD18S (HEAT EXCHANGER) CD18S (ALL PARTS) CD24S (HEAT EXCHANGER) CD24S (ALL PARTS) CD30S (HEAT EXCHANGER) CD30S (ALL PARTS)