Manufacturer Name: MAMAC Systems Product Number: EP-313-315 OEM Part Number: EP-313-315 The MAMAC Systems EP-313-315 18-28Vac/Dc-3/15# Ep Xdcr W/Or is an innovative electronic pressure transducer that improves HVAC system performance. This gadget has a 3/15-inch connector and runs on a power supply of 18–28 volts AC/DC.To provide exact monitoring and management, the device measur... https://www.partshnc.com/18-28vacdc-315-ep-xdcr-wor