The L61 and L62 Series safety shutoff devices are for use on standing pilot equipment that requires main burner shutoff when the pilot flame heating the thermocouple is extinguished. Typical applications include domestic central heating, commercial space heating appliances, industrial processing equipment, etc. The L61LL-1 & L62AA-5 are for use with natural gas only. The L62GB-1, 3 may be used with natural or LP gas and has a maximum operation pressure of 0.5 psi.