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Relieves pressures built up in large workshop oil lines where heat and cold expansion creates pressures when using air operated pumps
For protection against system pressure increase due to oil thermal expansion (1¼C increase in temperature can cause 10 bar increase in system pressure)
870psi valve opening pressure
Can connect to either a ¯ 1/4" hose with a clamp or a hose with 1/8" BSP (F)
Inlet/Outlet: 1/2"F / 3/4"M