UL 1121 PDF


Marine Through-Hull Fittings and Sea-Valves

Published by Publication Date Number of Pages
UL 11/18/1998 18
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UL 1121 – Marine Through-Hull Fittings and Sea-Valves

Please note: All interim revisions for this edition available at time of your purchase will be included.

UL Standard for Safety for Marine Through-Hull Fittings and Sea-Valves,

UL 1121


These requirements cover marine through hull fittings intended to be used above or below the water line and marine sea valves for use as shut off devices to effect positive closure of boat hull penetrations.

These requirements do not cover the use of shut off devices as a means of establishing or controlling the flow rate of a liquid.

Requirements for the installation and use of marine through-hull hull fittings and seacocks covered by these requirements are included in Recommended Practices and Standards Covering Seacocks, Through-hull Hull Connections, and Drain Plugs, ABYC H 27, and the Recommended Practices and Standards Covering Installation and Protection of Hull Openings Between Waterline and Sheer Line, ABYC H 15.

A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire, electric shock, or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the acceptable level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard cannot be judged to comply with this standard. Where considered appropriate, revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

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