Our range of Hansen glass reinforced nylon threaded fittings is suitable for use in irrigation systems, domestic & commercial plumbing, industrial systems, council water pipelines and nearly any other water system. They are not suitable for use in chlorinated swimming pools but are fine in salt water pools and sea-water applications. Many people have difficulty in identifying exactly what size fitting they have so click on the link here to download the "How to identify the size of a BSP threaded fitting" information sheet for all of the details.