Manufacturer Name: Resideo Product Number: L4006A1967 OEM Part Number: L4006A1967 Product Description: 100-240F Immaquastat Adj Dif Weight:1.47lbs/666.78g The Resideo L4006A1967 High/Low Limit Aquastat Controller is an essential feature for controlling the right temperatures in hydronic heating systems. This device acts as a safety and control in that it prevents the system. ... https://www.partshnc.com/l4006a1967-resideo-100-240f-immaquastat-adj-dif