Hot Tub Spa 1" X 3/4" Barb Pump Union O-Ring Use with Tiny Might and other Pumps

You are buying a 1" FTB X 3/4" Barb Pump Union with O-ring that matches the Union.The Union receives a 3/4" Inside Diameter Hose which measures about 1" on the outside and then Screws to a 1" Wetend (Pump) Threaded Part on the other side the threads will measure approximately 1 7/8" outside to outside. It will receive a 3/4" hose over the barb and screw to a 1" Wet End fitting. Don't be confused we also offer other 1" pump unions a well as Pump unions that are 1 1/2" Slip X 1 1/2" Pump Wet End or  2" Slip X 2" Pump Wetend  or a 2" Slip X 2 1/2" pump Wet End. If your plumbing hose is 3/4" Inside and your Pump Wetend Thread is 1" Meaning it measures 1 7/8" Across then this part is correct. Generally This fits a Waterway Tiny Might pump both suction and pressure.