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Square opening does not measure the same on both sides
This is the most common replacement plug size in the US
which is best used in a series of four
There is an optional heavy duty 2 inch strap with swivel spring clip that clips onto (2) 1/4" chisel-steel attachment loops
Lubricates gaskets for longer life and easier use
Aluminum 4" NH to 4" NPT Double Female Couplings_Brass Square opening does not measureAluminum adapters are fabricated from seamless extruded 6061 T6 aluminum and hard coat anodized per MIL A 8625 Type III, Class 1. Threads have a blunt start Higbee cut with indicators on adjacent lugs. Part identifications are permanent and stamped prior to hardcoat. Adapters and components meet the requirements of NFPA 1963. A double swivel adapter will not swivel or rotate once both ends are tightened to the male connections. The Safe Water Drinking