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2 Lug Air Hose Coupling [21DPME075] – NECO
Husky 5-Piece 1/4 in. NPT x 3/8 in. Automotive-Style Quick-Connector Coupler Kit HKATA091002 - The Home Depot
Air Hose Six Ball Coupler Industrial Interchange
LBY Air Coupler and Plug Kit,Air Hose Fittings, Industrial Type C Air Compressor Pneumatic Connector, SM20/30/40+PM20/30/40 Quick Connect Accessories Kit, Pack of 6 - Amazon.com
Hromee 18 Pieces Air Coupler and Plug Kit, 1/4-Inch NPT Air Hose Fittings and Compressor Accessories with Universal Quick Coupler, Brass Ball Valve, Swivel Air Plug and Tee Pipe Fitting - Amazon.com
Husky 1/4 in. Universal Coupler HDB20500AV - The Home Depot
Dixon Air Chief Steel Industrial Coupler 3/8 in. Hose Barb x 1/2 in. Body - John M. Ellsworth Co. Inc.
3PCS Quick Coupler Air Hose Connector Fittings 1/4 NPT Plug Compressor US JP EU Wholesale & Drop Ship - AliExpress
SILATU 1/4 Air Hose Fittings - 1/4 Inch Quick Connect Air Hose Fitting, 5-Pieces Female Air Coupler and Plug Kit For Air Tool Fittings - Amazon.com
1/4" Coupling x 1/4" Inch NPT Female &Male Brass Air Hose Quick Connect Adapter,Air Coupler and Plug Kit,Air Compressor Fittings 10pcs (male&female) - Amazon.com
3/8 Female Air Coupler x 1/4 FPT (Automotive Style)
JACO Hi-Flo Quick Connect Air Hose Fittings - 1/4" NPT | High Flow Plug & Coupler Kit, Type V (Set of 12) - Amazon.com