1/2 NPT Female Solid Brass Three Piece Pipe Union Fitting Adapter – compressor-source

1/2 to 3/8 Reducer, Vfauosit 3/8 to 1/2 RV Faucet Adapter Brass Compression Fitting Faucet Supply Line Adapter for Plumbing Water Hose 2 Pieces

HANSUM 1/4 Male Flare Gas Adapter Metals Brass Fittings for Copper Tubing Pipe Half Union Connector Coupling AC Tube Coupler Extension Joint Connectors Mini Split (1/4,2packs Male Flare+4packs Nut)

Pipe Fittings & Accessories – tagged Unions – compressor-source

HOME-FLEX 1 in. CSST x 1 in. FIPT Brass Female Adapter 11-435-010 - The Home Depot

Air Compressor Tank Port Fittings NPT 1/4 3/8 1/2'' Solid Brass Male Thread Water Drain Safety Valve Replacement Part

HOME-FLEX 1/2 in. CSST x 1/2 in. MIPT Brass Male Adapter 11-436-005 - The Home Depot

Legines Brass 3/8 NPT Female x 1/4 NPT Female Reducing Coupling, Hex Reducer Coupler Adapter Pipe Fitting 1200psi (Pack of 2) : Industrial & Scientific

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Water Source 1-1/2 in. Brass Male Insert Adapter MA150NL - The Home Depot

1/2 NPT Female Solid Brass Three Piece Pipe Union Fitting Adapter – compressor-source

Adapter Nipple 1/2 Male x 1 “ Female - Brass Adapter 0,5 inch x 1 “ inch Female Pack of 5 : Industrial & Scientific