Windtech M-16 Microphone Thread Adapter - 3/8 Inch-16 Female to 5/8 Inch-27 Male | Location Sound
Triad-Orbit 5/8" to 3/8"-16 Camera Adapter 3/8ADA B&H Photo Video
3/8" to 5/16" Fuel Line Adapter Fitting
LTWFITTING 5/16 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF685605 - The Home Depot
3/8" NPT Male to 5/16" Inverted Flare Female Adapter Fitting
LTWFITTING 5/16 in. ID Hose Barb x 3/8 in. MIP Lead Free Brass Adapter Fitting (5-Pack) HFLF39185605 - The Home Depot
JEGS 159202: Captive Nut Adapter Fitting 5/16" Hard Line x 3/8" Hose Barb - JEGS
Amazon.com: ICT Billet 5/16 Fuel Rail Male Quick Connect to 3/8" NPT Adapter Fitting Hose Thread Fuel Oil Gas Coolant Connector Pipe End Braided Plumbing Port Fluid Aluminum AN817-01-06NP : Automotive
Eaton - Barbed Hose Fitting: 3/8″ x 5/16″ ID Hose, Connector - 52690328 - MSC Industrial Supply
Adapter, QDF 3/8" » 5/16" Barb, Black (QDA-38FHB56CL): EFI Adapters - Quick Connect Female » AN JIC | Racetronix
Lead Free Brass Compression Male Adapters - 5/16"T x 3/8" MIP
Amazon.com: Brass Hose Barb Reducer, 3/8" to 5/16" Barb Hose ID, Reducing Barb Brabed Fittings Splicer Mender Union Air Gas Water Fuel Line Heater Garden Pond Poly Tubing Adapter (Pack of 2) :
Amazon.com: Beduan Brass Hose Barb Reducer, 3/8" to 5/16" Barb Hose ID, Reducing Barb Brabed Fitting Splicer Mender Union Air Water Fuel (Pack of 2) : Industrial & Scientific
CARBURETOR FUEL LINE ADAPTER 3/8" MALE x 5/16" FEMALE INVERTED FLARE | eBay
3/8" NPT Male To 5/16" Inverted Flare Female Adapter Fitting - BF56 - Affordable Street Rods