Valemo AD1S Powerhead, 24 VAC, with End Switch, 18" Leads - Replacement for Honeywell V8043E and V8043A power heads Quality tested for over 100K cycles of flawless operation All metal gears inside / Durable construction Durable aluminum cover, Stainless steel / corrosion resistant housing 24 VAC Normally closed (NC) Designed for quick and easy installation