This LTWFITTING Compression tube fitting is made of brass for durable. And it connects to tubing on one end and has an NPT male connector on the
Brass Compression Tube Fittings For Air And Water Popular Styles
LTWFITTING 5/8 in. Brass Compression Insert Fitting (50-Pack
Everbilt 5/8 in. OD Compression x 1/2 in. MIP Brass Adapter Fitting 801099 - The Home Depot
LTWFITTING 1/4 in. O.D. x 1/8 in. MIP Brass Compression 90-Degree
LTWFITTING 5/8 in. O.D. Comp x 1/2 in. MIP Brass Compression
LTWFITTING 5/16 in. O.D. Comp x 1/8 in. MIP Brass Compression Adapter Fitting (25-Pack) HF685225 - The Home Depot
LTWFITTING 5/8 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF6810605 - The Home Depot
LTWFITTING 1/8 in. MIP Brass Pipe Hex Head Plug Fitting (10-Pack
LTWFITTING Brass 5/8-Inch OD x 3/8-Inch Male NPT
Everbilt 5/8 in. OD Compression x 1/2 in. MIP Brass Adapter
LTWFITTING 1/2 in. O.D. Comp x 3/4 in. MIP Brass Compression
LTWFITTING Brass 3/8-Inch OD x 1/4-Inch Male NPT
LTWFITTING 5/8 in. O.D. Comp x 3/8 in. MIP Brass Compression
LTWFITTING 3/8 in. O.D. Comp x 1/8 in. MIP Brass Compression