Mounting bracket is sized by the diameter of the hose used with the strainer.
The bracket acutally holds the inflow and outflow hoses, with the strainer suspended in between the arms.
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Sherwood 14238-SHW Raw Water Strainer Bracket – for 1-1/4″ Strainer Only
Raw Water Strainer Bracket – for 1-1/4″ Strainer Only.