British Standard Pipe Fittings

British Standard hose fittings and hose connector are available in two versions, a parallel thread (BSPP, also known as "G") and a taper thread (BSPT, also known as "R").
The BSPP connection is similar to National Pipe Straight Mechanical (NPSM), except the the thread pitches are different in most sizes. The BSPP female swivel has a tapered nose/Globe seal flare less swivel which seals on the cone seat of the male. While many users mistakenly identify Bsp fitting as metric, these fittings are actually measured in inches. Some Japanese ( JIS 30°) fittings also use BSPP threads.