Simple to Use - Pisces male multi stage hosetail with a 20/13/9mm (Internal diameter)staged barb fitting and a 0.5" BSP thread for connection to a hosepipe of the same diameter. Barbed fitting - Each connector has a barbed texture edging that allows for a secure grip and fit onto the pond hose. Strong Materials - Made of strong plastic material, the fitting adaptor is made to last and is up to various tasks around the garden and home. Multiple Uses - Can be used on Pond hosing, hosepipes, pipe tubes, Pond pumps, filters or UVs, irrigation systems, agricultural or lawn equipment, and hydroponics. Please note: All our threaded fittings are BSP fittings to determine the BSP size, please take the imperial measurement of the external diameter of the thread and minus ¼" - this will give you the BSP size ie: The external measurement is 1" - then you require a 1" BSP fitting., Manufacturer: Pisces