SIT 820 Series Millivolt Fireplace Valve 30% Turndown Propane. Sit quick dropout gas valve Propane. 30% turndown (11″ – 5.3″). 3/8 inlet / outlet. Requires thermopile and thermocouple for operation. Sit part # 0820651. NOT FOR VENT FREE UNITS. Lennox: 88J53 / 88J5301 / 902160. Majestic / Instaflame / Majco / CFM: 37D0118 / 52678 / 7529142. SIT: 0820651 / 820.651 / 820651.