Manufacturer Name: Hydrolevel Product Number: 1100 OEM Part Number: 1100 Product Description: 24Vac Lwco W/Testbut&Wireharne Weight:0.68lbs/308.44g The Hydro level 1100 Low Water Cut-Off with Test Button & Wire Harness is a safety part for HVAC systems used to prevent dry firing and system damage in commercial and residential boilers. It operates at 24VAC and detects low water ... https://www.partshnc.com/1100-hydrolevel-24vac-lwco-wtestbutwireharne