Spa Barbed Fittings Glossary

Posted by on 2/29/2024 to Glossary

Barbed Injector Fitting or Pump Barb Fitting: Threaded fitting used to replace the drain plug. Male threaded on one side, and ribbed barb on the other, it can screw into the wet end and attach to a nylon hose to aid in priming the pump.
MPT or Male Pipe Thread: See "NPT Pipe Thread"
NPT or National Pipe Thread: U.S. national technical standards for screw threads used on threaded pipes and pipe fittings. This is the most common threading used in the United States.
SB or Slip Barb (Hose Barb): A type of plumbing connection where a plumbing fitting will connect inside of tubing or hose. The insert portion of the fitting with a smooth surface with no ribbing. These connections are typically secured with clamps, and occasionally glue.
RB or Ribbed Barb (Hose Barb): A type of plumbing connection where a plumbing fitting will connect inside of tubing or hose. The portion of the fitting has raised, and slanted areas designed to hold the hose on the fitting. The concept is similar to the tip of a fishing hook. This allows for easy installation, but removal is more difficult. These connections are typically secured with clamps, and occasionally glue.