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The A Y McDonald aym-72101bbtc 3/4 is a vent baseboard tee elbow with cap designed for hydronic heating and plumbing distribution systems. This fitting combines a tee and elbow configuration with a capped outlet, allowing branch connections and directional changes within a single component. The connection configuration is SWT x MNPT x SWT, and the outside diameter measures 0.75 inches. Licensed plumbers and hydronic heating technicians install this fitting when running baseboard radiation supply and return lines that require a branch takeoff with a capped service port.
This fitting is suited for residential and light commercial hydronic baseboard heating installations. The 3/4 inch sweat inlets accommodate standard copper tubing runs, while the 3/8 inch male NPT port provides a threaded connection point for a bleed valve, sensor, or service access. The integral cap keeps the threaded port closed when not in use. It is typically installed at baseboard element termination points or intermediate branch locations within a hot water heating loop.
Designed as an OEM-style replacement or new-installation fitting for residential and light commercial hydronic baseboard heating copper piping systems using 3/4 inch sweat connections.
Installation should be performed by a licensed plumber in accordance with applicable IPC and local plumbing codes. Drain and depressurize the hydronic system and allow all piping to cool completely before cutting into existing lines. Sweat connections require clean, dry, deburred pipe ends and proper flux application before soldering. Do not apply heat near the threaded cap if it is made of a material incompatible with soldering temperatures; install the cap after all soldering is complete.
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