The SM-PM1 is a 3/4 inch threaded pipe plate for standard 3/4 NTS pipe. The SM-PM1 slides into the SM-WM1 wall plate and also screws in to the SM-SW1 swivel. *Two (2) SM-PM1’s are necessary for pipe mounting; one to attach to the wall or ceiling, and the second to attach to the SM-SW1.
*This of course depends on what the installation location demands.
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