Plumbing Terminology - U

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With an undercover is meant the underside portion of some faucets which also use a top shroud to cover an assembled faucet waterway.

Undermount Lavatory

An Undermount Lavatory is a type of lavatory of which the body of the sink attaches to the underside of the countertop. Depending on the design of the sink, faucets can be mounted on the countertop or the sink itself.

Union Plumbers

Union Plumbers are part of an organization of workers who have banded together to achieve common goals like better working conditions. This may include the negotiation of wages, work rules, complaint procedures, rules governing hiring, firing and promotion of workers, benefits, workplace safety and policies.


A urinal is a kind of toilet which receives only liquid body waste and conveys the waste through a trap seal into a gravity drainage system.