Groco type “IBV & IBV-S” Valves are UL Marine Listed.
The “IBS” Ball Valve is 400 WOG rated.
The “IBV-S” Ball Valve is 1000 WOG rated.
UL Standard 1121 Marine Through-Hull Fittings and Sea-Valves
Materials: The components of a through-hull fitting or sea valve shall be formed of galvanically compatible materials having the strength and resistance to corrosion
necessary to withstand intended and abnormal use to which they are likely to be subjected.
A part made of drawn brass or machined from brass rod containing more than 15 percent zinc shall be subjected to the 10-Day Moist Ammonia-Air Stress Cracking Test (Section 19). After being tested, a brass part containing more than 15 percent zinc shall show no evidence of cracking or delamination
when examined using 25X magnification.
Thru-hull fittings that meet ABYC H-27 are entitled to so mark the fitting, and thru-hull fittings that are UL Listed are also entitled to so mark the fitting.
• The Listing Mark of Underwriters Laboratories Inc. on the smallest unit container in which the product is packaged or on the product is the only method provided by UL to identify products manufactured under its Listing and Follow-Up Service
UL publishes an annual Directory of Marine Products that contains Listings and Classifications and Recognitions in effect as of an annual date. Manufacturers that have submitted thru-hull fittings and sea valves for testing and that have passed UL 1121 standard, are listed in this catalog. The catalog identifies which particular models, and sizes of specific manufacturers that have achieved UL Listing and are entitled to display the UL Listing Mark.
Marine products catalogs in general do not indicate which, if any, of the “Bronze” thru-hull fittings offered for sale
are UL Listed or meet H-27, in which case one should query the manufacturer directly.