2.5" Split Nut Union 0121108025 is a heater split nut for 2 1/2 inch plumbing connection and a 3 inch id heater.
Connects 2 1/2 inch plumbing to a 3 inch id heater.
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121108025
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1.5" FBT Repair Split Nut with Screws 0121109015. This is a repair split nut for 1 1/2 inch pump connections. 1 1/2 inch refers to the inner diameter of the attached plumbing/hose/pipe.