ug. but do not over tighten. 880 S.I.T. VALVE DESCRIPTION 1) Pilot adjustment 2) Outlet Pressure Tap 3) Inlet Pressure Tap 4) Pilot Outlet 5) Main Gas Outlet 6) Main Gas Inlet 2 AERATION ADJUSTMENT The burner aeration is factory set but may need adjusting due to either the local gas supply or altitud