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Chek-Lok® Excess Flow Valves are designed to provide a convenient means of withdrawing liquid from stationary containers prior to moving the container. The Chek-Lok® permits one transfer shut-off valve with an adapter to be used interchangeably on a number of tanks.

The 7590U and 7591U Chek-Loks® are also designed for use on permanent installations provided the excess flow valve is sized properly for the system and piping.
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Item #

Inlet Connection

Outlet Connection

A. Body Wrench Hex Flats

B. Approximate Effective Length

C. Cap Wrench Hex Flats

7590U N/A 3/4" M. NPT N/A 1-5/8" UNF N/A 1-5/8 in N/A 1-7/16 in N/A 1-5/16 in
7591U N/A 1-1/4" M. NPT N/A 1-5/8" UNF N/A 1-3/4 in N/A 1-11/16 in N/A 1-5/16 in
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