This MTM Hydro Unloader Valve without Knob MG4000 (8.712-715.0) is constructed with a forged brass body. It does not have a knob for adjustment.

This MTM Hydro Unloader Valve without Knob MG4000 (8.712-715.0) is constructed with a forged brass body. It does not have a knob for adjustment.
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