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

1/2 MNPT x 1/4 FNPT Solid Brass Bushings Reducer Fitting Adapter 281 – compressor-source

3/4 x 3/4 Female Inverted Flare x Male NPTF Adapter Solid Yellow Brass 202JJ

SUNGATOR Brass Pipe Fitting,NPT Reducer Adapter,1/4 Inch Male Pipe x 1/2 Inch Female Pipe,1/4'' Male to 1/2'' Female Hex Nipple Reducer Pipe Fitting, NPT Reducer for Water Line, Refrigeration (2-Pack)

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

Adapter Nipple 3/4 Male x 1 “ Female Pipe Fitting NPT - Brass Adapter 3/4 inch x 1inch Female Pack of 1

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

Pipe Fittings & Accessories – tagged Unions – compressor-source

3/8 NPTF Female Union Tee Solid Brass Pipe Fitting T Joint Hose Conne – compressor-source

2 Pack 3/8 x 1/4 MNPT Pipe Thread Brass Air Hose Barb Fitting For 3/8 Hose

3/4 X 3/4 Inch Female NPT In Line Brass Compressed Air Check Valve CIL3434U USA £23.78 - PicClick UK

1/4 NPT Extender Pipe Fitting 1-9/16 Long Solid Brass Pressure Gauge Adapter

Husky 1/4 in. Female x 1/4 in. Female x 1/4 in. Male Brass Tee Fitting HDA30700AV - The Home Depot

1/2 x 1/2 Compression Male NPTF Adapter Solid Brass Compression Fitt – compressor-source

SDTC Tech 2-Pack Brass Pipe Fitting 1/2 NPT Thread Male to 3/4 NPT Thread Female Reducer Adapter

Adopter Unions, PVC-U Brass (S x R) - Aplaco

Union Brass Pipe Fpt 1-1/2

Uxcell 3/4 OD Brass Flare Union Connector, 1 Set Copper Double Pipe Extension Fitting with Nut, 1.85x1.06

DOT Approved Air Brake Fitting Union, Push-To-Connect Fitting

Best Price Brass Union Assembly (2N+2S) BSP Compression Pipe