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Brass trapped pressure unloader valve with a single bypass port. This unloader maintains desired pressure level when the line is open, and goes into bypass when closed. It's built for incredible reliability, easy maintenance, and can be panel mounted if desired.
The General Pump ZH1520 Unloader is a brass valve with a single bypass port and 1" female NPT ports. Designed for top reliability and easy maintenance, this industrial-grade unloader maintains consistent desired pressure level when the line is open, and goes into bypass when the line is closed. General Pump recommends using a safety relief device in conjunction with this unloader when installed on positive displacement pumps.