Combination nipples are made from tubular stock to fit straight end hose. The straight end has a BSP thread.
Combination nipples are recommended for low-pressure discharge and suction service for compatible liquids. Not for compressible liquids such as air, nitrogen or steam.
The working pressure of combination nipples will vary with the size and construction of the hose, the type and number of clamps used, clamp placement, proper installation of clamps, temperature and the product being conveyed.