This kit contains two 1/2" 45° water bypass fittings and one 3/4" straight bilge fitting.  These fittings are made in-house in the USA on our Haas CNC machines from 6061 aluminum and then anodize in clear for durability and aesthetics.  The 1/2" bypass fittings are for 1/2" inner diameter water line and the 3/4" bilge fitting is for 3/4" inner diameter bilge hose.  This is the standard hose sizes on Yamaha boats like the AR and SX series with the TR-1 and 1.8L 4-stroke engines.