You are buying a 1" FTB X 1" Barb Pump Union with O-ring that matches the Union. The Union receives a 1" Inside Diameter Hose which measures about 11/4" on the outside and then Screws to a 1" Wet End (Pump) Threaded Part on the other side the threads will measure approximately 1 7/8" outside to outside. It will receive a 1" hose over the barb and screws 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 Wet End 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.
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