1.1/4" Stainless Steel 150 lb Screwed Half Socket BSP F. 316 stainless steel fittings manufactured to BS 1740. Stainless steel is to BS 316 S11 (EN 1088-3 1-440). 150 p.s.i. (10 bar) maximum working pressure. BSP threads to BS 21. Suitable for Natural gas, LPG, hot and cold water, and other applications.