liquidtight

Liquidtight is a designation used in electrical and plumbing contexts to describe products and assemblies designed to prevent the intrusion of liquids while allowing connection and movement. In electrical work, liquid-tight components are intended for use in wet locations or outdoors, where exposure to moisture or splashing water is expected.

The main forms include liquid-tight conduits, which can be flexible metal conduits that are coated or sheathed, and nonmetallic conduits such as flexible plastic hoses. They employ listed fittings and connectors with seals to maintain the liquid-tight integrity. Liquid-tight seals are also used on enclosures, outlet boxes, and equipment housings to prevent water ingress.

Materials used for liquid-tight products vary with type and application. Liquid-tight metal conduits are typically made from galvanized or stainless steel, while nonmetallic options use polymers such as PVC, neoprene, or other elastomeric compounds. Housings and gaskets are chosen for chemical resistance, temperature range, and exposure to sunlight in outdoor settings.

Applications for liquidtight systems include outdoor lighting, pumps and motors, irrigation systems, pools and marine environments, outdoor signage, and other installations exposed to moisture or humidity. Some designs provide protection against rain or hose-directed water, and certain assemblies are rated for immersion, depending on the product’s specification.

Standards and ratings for liquidtight products are usually provided by safety organizations such as UL or CSA, with additional IP or NEMA ratings indicating the degree of liquid ingress protection. Users should check the product labeling for exact ratings and follow local electrical or plumbing codes and installation instructions.

See also: electrical conduit, weatherproof enclosures, gaskets and seals.