Replaces PP221 nozzle with o-ring is for the 110k and 115k BTU heaters as well as the 125k BTU heater that has the plastic shell on the tank. Below are some of the models that use the PP221 nozzle: 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. Fits:DESA,for Dayton, for Knipco, for Koehring, for Master, for Reddy, for Remington, for Sears, and for TSC: (PP221, HA3027, 100735-19, 100735-23) Please check before purchasing to make sure it will fit your equipment Good service, If you have any questions, , please contact us, we will give you a reply within 24 hours. FIts： The PP221 nozzle with o-ring is for the 110k and 115k BTU heaters as well as the 125k BTU heater that has the plastic shell on the tank. Numbers stamped on nozzle: 100735-19 Below are some of the models that use the PP221 nozzle: 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. DESA: For Dayton,For Knipco,For Koehring, For Master, For Reddy, For Remington, For Sears, and for TSC: (PP221, HA3027, 100735-19, 100735-23) Will also work in Procom PCK110VT