AO Smith 100208475 Connection Board voomi_id_35976 This expansion valve showcases excellent

This expansion valve showcases excellent durability and resistance to corrosive elements

Subcategory: Ventilation - Residential

Application: Electrical Wiring

Part: 21X19

Compatible with various zone valves

AO Smith 100208475 Connection Board voomi_id_35976 This expansion valve showcases excellentAO Smith 100208475 Connection Board Please note: All control boards are non returnable. We ask that you double check that you have the correct part number before ordering. Control Boards are still eligible for the original manufacturers warranty. We can facilitate the warranty process for you and provide you with a list of required documentation.