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ProSport Radiator Hose Adaptor for Water Temperature Gauge Size: 28mm - Purple, 30mm - Blue, 32mm - Gold, 34mm - Red, 38mm - Silver Part Number: PSWT3 Made from 6061 Aluminum this in-line radiator hose adaptor will make installing your temp. sender a breeze. This will place the water sensor directly in the stream of the water towards the radiator without absorbing transient heat from the engine block for accurate readings of the water temperature. Four sizes are available for the perfect fit for just about any engine application and stays water-tight to prevent leaks with the provided hose clamps. Each adapter features an 1/8” NPT fitting. This requires you to cut your radiator hose to install this. Measure the inside diameter in mm to choose the correct size for your vehicle.