Superior performance, durable construction, valve body forged brass, actuator with all metal gears inside and corrosion-resistant stainless steel housing. Controlling flow of water in hydronic heating or cooling systems, normally closed (NC), 24V power supply, Includes end switch for signal feedback and control. 1/2" soldering/sweat connections. Frequency - 50/60 Hz. Wire length - 18" </p>Perfect replacement for any of the following zone valve installations: <br>- Honeywell: V8043, V8044, V2031A,B, V8031A,B, V8343A,B <br>- Belimo <br>- Caleffi <br>- Erie/Schneider: VT2312 VT2313 VT2315 VT2317 <br>- Barber Colman: VA1403 <br>- Bell & Gossett: TEV 3/4, MI, 109020 & 109031 <br>- Flair: VJ1C2, VJ2C2, V2ACA, VJ1B2, VJ1E2, VJ2D2, VJ020 <br>- Taco: 556, 557, 571, 548A, 545 <br>- Erie: 0765, 0767,635B8-18A-8, 635B307-18A1, 635B307-18A0, 601, 607, 612, 621, 627 and 647 <br>- Superior: UA182 <br>- White Rodgers: 1361-102, 13A01-102, 13A02-102, 13A02-102, 13A03-1, 12, 1311-103, 1361-103 <br>- Detroit: ZV200, ZV210