Inner sactum oil galley plug

inertia said

Most houses infact do have accumulators, in the form of a plugged upright pipes located close to washing machines and showers.. An accumulator is merely a "hydraulic spring" to modulate or extend pressure, and the oil filter would puge in just a few seconds, because of the valve... cheers..

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That little piece of pipe sticking straight up is a air accumulator to stop your pipes from rattling it is not to store water in. When I talk about a pressure tank on a pump system it holds water to feed your house or your barn or whatever. It is an accumulator or pressure tank. That is the effect the oil filter is having on the oiling system.