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These Nylon buttons are replacements for your lost or damaged indexing buttons on your WaterSaver Faucet Company laboratory fixture and screw on easily with an adjustable wrench. These are for WaterSaver fixtures only and are not compatible with other manufacturers/brands such as Chicago Faucet (one customer has told us that they do fit Delta fixtures; please read the following specifications and judge for yourself). The threading is 5/8-18 UNF. The outer diameter of the button is 3/4" (19 mm) in the round part and 45/64" (18 mm) between the flat sides where the wrench goes. The overall height is 11/32" (9 mm) and the height above the threads is ~ 4 mm. THESE ARE SOLD INDIVIDUALLY.
Note: OXY and H2 buttons are only supplied by special order upon the customer providing proof that the valve for which they are purchased is a needle valve that has been specially cleaned for use with such service. This is done for safety reasons, as, for example, 100% oxygen can spontaneously ignite grease or other materials used in other gas systems.