SharkBite 3/4 in. x 1/2 in. Brass PEX Barb Reducer Coupling UC058LFA - The Home Depot
EPRC3412-NL Everflow 3/4" X 1/2" Brass PEX BARB Reducing Coupling American Copper & Brass
LTWFITTING 1/8 in. x 1/4 in. I.D. Brass Hose Barb Reducer Splicer Fittings (50-Pack) HF3913R040250 - The Home Depot
Apollo 3/4 in. x 1/2 in. Brass PEX-B Barb Reducing Coupling APXC1234 - The Home Depot
Apollo Pex 1/2 in. x 3/8 in. Brass PEX Barb Reducing Coupling APXC1238 | Zoro
Brass Barbed Insert Fittings and Adapters
Amazon.com: 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 : Automotive
LTWFITTING 3/8 in. x 1/2 in. I.D. Brass Hose Barb Reducer Splicer Fittings (25-Pack) HF3913R080625 - The Home Depot
Amazon.com: Quickun Brass Hose Barb Reducer 1" to 5/8" Barbed Reducer Fitting Reducing Splicer Mender Union Adapter for Air Water Fuel : Industrial & Scientific
The ROP Shop 3/4" x 1/2" PEX Brass Reducing Coupling Barbed Crimp Fitting, Lead Free - The Rop Shop