The DES PP221 or HA3027 nozzle kit from equipsupply.com fits Desa brands, Master, Reddy, and Remington torpedo and salamander type kerosene forced air heaters. Please note that the number that is stamped on the PP221 nozzle from equipsupply.com is not the part number. The DES PP221 nozzle kit from equipsupply.com includes the nozzle and the o-ring, and should always be replaced together. Also, heaters do require different nozzles due to different fuel flow rates. The following is a list of some of the heaters that use the DES PP221 or HA3027 nozzle kit from equipsupply.com; B110B, B110BT, B115, B115CT, B115DT, B115T, BC115DT, M125AT, M125T, M125TH, PK110, PK115T, PKC115DT, R110B, R110BT, R110C, R115, R115C, R115DT, R115T, RC115CT, RC115DT, RC115T, RE125AT, RE125T, REM110B, REM110BT, REM115, REM115C, REM115DT, REM115T, RH125AT, RH125T, RHD125T, RL125T, RM115, RM115CT, RM115DT, UK115T, UKC115DT, 3E218E, 3E218F,& others.