ICT Billet 5/8 to 3/4 Inch Hose Barb Splice Coupler Reducer Repair Fitting Adapter Connector Radiator Coolant Intercooler Heat Exchanger Fluid Designed & Manufactured in USA Bare Aluminum AN627-11A

I like every thing about it. The I.D. is the same the whole length. Machining is smooth and well done. Standard 3/4 and 5/8 heater hoses fit perfectly.

Works perfect to adapt my hose!

Used this for adapting a aux heater water pump on an Ford Explorer. Works fine, no problems.

Well made and works great.

Very difficult to assemble and positively clamp hose ends to this reducer /adapter. Had to replace rubber hoses, new clamps and double clamp each end to finally seal up the connection. I would like to see this part with more aggressive barbs /ribbing to better bind with hose ends; this may help seal up to prevent leaks.

Good adapter

Worked perfect for my heater hose havent ran the engine much yet but looks like a quality fitting

Used on auto coolant system

Using for heater hose reduction

Put this in a Camaro to unite two different size heater hoses because my heater core was leaking and this way was able to bypass heater core and connect the 5/8 inch hose from the radiator to the 3/4 inch hose going to the engine..