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A maintenance-free installation 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-750B Water Hammer Arrestor, 3/4 in, NPT, 250 psi, 32 to 212 deg F, Brass/Copper, 7-1/4 in L, Lead-Free