1/4" x 1/8" Comp (3/8" Bulkhead) WADE compression fittings to BS 2051-2:1984 Made in the UK by a BS EN ISO 9001:2008 registered company (except P/N 9506). Fitted with soft copper parallel olives. Sizes refer to the outside diameter of tube to be used. Suitable for natural gas, LPG and water. Reducing compresion bulkhead couplings.