Parker - Barbed Hose Fitting: 3/8" x 5/16" ID Hose, Male Connector - 01045426 - MSC Industrial Supply
Amazon.com: ICT Billet Straight 3/8" NPT Pipe to 5/8" .625" Hose Barb Fitting Bare Aluminum National Pipe Thread Connector Fluid or Air Designed & Manufactured in the USA AN840-10-06A : Automotive
LTWFITTING 3/8 in. x 5/8 in. I.D. Brass Hose Barb Reducer Splicer Fittings (25-Pack) HF3913R100625 - The Home Depot
Tacoma Screw Products | 5/8" H x 3/8" NPT Hose Barb Fitting — Hose Barb to Taper Male Pipe