Dorman - HELP | Heater hose connectors - 5/8 in. Hose x 3/8 in. Npt x 2-3/4 in. Long nipple 56365
Heater Hose End Fitting - Straight with 1/2" NPT and 3/4" Barb. - Edelbrock, LLC.
Spectre 5953 Heater Hose Fitting
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3/4 to 5/16 to 3/4inch Tee Aluminum Heater Hose Connector Coolant Fitting Metal | eBay