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"If there be any among us who [disagree], let them stand undisturbed as monuments of the safety with which error of opinion may be tolerated, where reason is left free to combat it." Thomas Jefferson, March 4, 1801
Adjustable Spring Check Valve. 3/4" fpt x 3/4" mpt. Seats EPDM. External Arrow Flow Indicator. Rated to 200 psi water at 73?. Adjustable feature allows control of back pressure in system, reduces water hammer, and prevents siphoning. Easily adjusts to hold back from 5 to 32 feet of pressure head, 1 psi (2.3 feet of head) for each full turn of the adjustment screw. Ideal for landscape and irrigation applications, quickly installs with space saving in-line design. 2 - 14 lbs. Adjustable Spring Tension (5 to 32 feet of head) Factory Preset to Approx. 5 psi (12' of head). Stainless Steel Adjustment Spring with EPDM Seat