British Standard Pipe fittings and connectors

bsp swivel fittings and connectors 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/Globeseal flareless swivel which seals on the cone seat of the male. While many users mistakenly identify BSPP fittings as metric, these Bsp fittings are actually measured in inches. Some Japanese ( JIS 30°) fittings also use BSPP threads.