SharkBite 12-in 1/2-in Push Inlet x 3/4-in FIP Outlet Braided Stainless Steel Water Heater Connector in the Appliance Supply Lines & Drain Hoses department at Lowes.com
HE125J – 3/4 Heater Hose Tee – Couplings Company
3/4 to 5/16 to 3/4inch Tee Aluminum Heater Hose Connector Coolant Fitting Metal | eBay
Dorman - HELP 3/4in X 3/4in Heater Hose Connectors
Dorman HELP! 5/8 Inch Heater Hose Tee 56387 | O'Reilly Auto Parts
2Pcs 3/4" x 3/4" x 3/4" Tee Coolant Heater Hose Connectors Fittings Adapters Aluminum Alloy Silver Fit for Car - AliExpress
Amazon.com: Four Seasons 84544 Tee Heater Fitting : Automotive
Coolant Hose T Fitting Radiator Hose T - Size 1-3/4" X 1-3/4" X
3/4 X 3/4 X 5/8 Tee Connector For Heater Hose | Imperial Supplies
Dorman - HELP 3/4in X 3/4in Heater Hose Connectors