Back-pressure regulator Parker Porter Instrument Division

The Porter Model 4000 Regulator is a high performance miniature size
pressure regulator.With a compact diameter of only 1 1/8”, it fits easily
into the smallest of instruments, yet its performance surpasses that of many
competitive large diaphragm regulators. It is direct acting, non-relieving and
provides minimal output change over a wide variation in supply pressure.

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