Leakproof Fittings
Leakproof fittings use a rubber seal rather than a ball check for light oils and hydraulic fluids. It is important to keep input passages free from contamination. In critical applications where back pressure is needed, it is recommended that seals be redundant. Leakproof fittings are recommended for pressures up to 5000 pounds. They are not suitable as check valves where high sustained back pressure is prevalent. The finish can either be zinc yellow or zinc clear.

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