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A maintenance-free instllation is assured when using this type of arrestor...the only moving part is the free-moving piston furnished with "O"ring seals which have been tested for reliability in excess of normal operating ranges.
PPP SC-500A Water Hammer Arrestor, 1/2 in, NPT, 250 psi, 32 to 212 deg F, Brass, 6-1/4 in L, Lead-Free