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When to Use the Heavy Duty Spool Valve O-Rings

The Spool Valve O-Rings are located in the Head, which is the clear plastic piece in the center of the High Lifter.If you use the High Lifter at high inlet pressure, above 45psi, the standard duty Silicone Rubber orange o-rings, item 10-1311, may wear out prematurely. In that case, you can install the heavy duty EP Rubber black o-rings, set of 6, item 10-1316. If the High Lifter squeaks a lot and intermittently stops reciprocating, check the Spool Valve O-Rings. Look for flattening of the inner surface, which indicates excessive wear, causing water to leak by, which causes the squeaks.
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Heavy Duty Black Spool Valve O-Ring. Order 10-1316 for a set of 6. Shown larger than actual size.  black-o-ring-10-1332-single2.jpeg