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1/4 Female Air Coupler x 3/8 MPT (Industrial Style)
Brass 3/8" Barb X 1/4" NPT Male End Air Hose Pipe Fitting Threaded Connector
Amazon.com: Brass Hose Barb Reducer, 1/4" to 3/8" Barb Hose ID, Reducing Barb Brabed Fittings Splicer Mender Union Air Gas Water Fuel Line Heater Garden Pond Poly Tubing Adapter (Pack of 2) :
SUNGATOR 12-Pack Air Hose Fittings, 1/4" NPT to 3/8" Barb, Hose Barb Adapter... | eBay
2 Pack 3/8" x 1/4" MNPT Pipe Thread Brass Air Hose Barb Fitting For 3/ – compressor-source
Steelman 15-Foot Coiled 3/8-Inch Air Hose With 1/4-Inch Npt Fittings – Steelman Tools
WYNNsky Industrial Air Coupler, 1/4 Inch Body Size, 3/8 Inch FNPT Threads Size, Brass Air Compressor Accessories Fitting - - Amazon.com
Reusable Fitting, Quick Coupler 1/4" G Male x 9/32" Hose ID Air Hose Plug - 1/4" G x 8mm - Overstock - 28847668
Dixon Reusable Fitting 3/8 in. ID x 11/16 in. OD Hose x 1/4 in. Male NPTF - John M. Ellsworth Co. Inc.
Amazon.com: Beduan Brass Hose Barb Reducer, 1/4" to 3/8" Barb Hose ID, Reducing Barb Brabed Fitting Splicer Mender Union Air Water Fuel : Industrial & Scientific
Other Hydraulics & Pneumatics Hydraulics, Pneumatics, Pumps & Plumbing 1/4'' 3/8'' 1/2'' Euro Air Line Hose Compressor Fitting Coupler Quick ReleaMAEK YA9369229
Air Hose for Pneumatic Tools 1/4 in. Male x 3/8 in. Female Brass Pipe Reducer Coupler Connector Fitting 150 PSI Maximum 1/4 in 18 NPT Home Garage or Professional Shop: Amazon.com: Industrial & Scientific
Air Compressor Hose Fitting Adapter, 3/8 FNPT x 1/4-In. MNPT, 2-Pk. | True Value