1. SCOPE 1.1 These requirements cover low profile nylon isolating bushings with internal and
external threads and component thread sealant which are intended for use in the external
corrosion protection of underground steel tanks which have been installed in accordance with
requirements contained in the standard for External Corrosion Protection Systems for Steel
Underground Tanks for Flammable and Combustible Liquids, CAN/ULC-S603.1.