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Detail of the Urine Collection and Transfer Assembly connector on the PGA's left thigh.

The astronauts expected to be sealed in their spacesuit for several hours at a time (e.g., during launch preparations or during a lunar EVA), and in the event of a permanent pressure loss of the Command Module, they might need to remain in their suits for days at a time. To allow for urination, a Urine Collection Transfer Assembly was provided. It had a roll-on cuff, a bladder, and a discharge hose which attached to the the inside of this connector. Once the bladder was full, it could be drained through this connector.

The "Waste Management System" chapter of the Biomedical Results of Apollo contains a detached, scientific description (in typical NASAese) of how the UCTA worked, while this interview with Rusty Schweickart gives a more, um, "candid" description of its use.