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
LTWFITTING 1/8 in. OD Comp x 1/8 in. FIP Brass Compression Adapter
LTWFITTING Brass 1/2-Inch OD x 1/2-Inch Male NPT
LTWFITTING Brass 1/8-Inch OD x 1/8-Inch Male NPT
LTWFITTING 1/8 in. O.D. Comp x 1/8 in. MIP Brass Compression Adapter Fitting (25-Pack) HF682225 - The Home Depot
LTWFITTING 3/16 in. O.D. x 1/4 in. O.D. Brass Compression Reducing Coupling Fitting (25-Pack) HF62R3425 - The Home Depot
LTWFITTING Brass 7/8-Inch OD x 1/2-Inch Male NPT
LTWFITTING Brass 5/8-Inch OD x 1/2-Inch Male NPT Compression Connector Fitting(Pack of 5) : Industrial & Scientific
LTWFITTING 1/8 in. O.D. Comp x 1/8 in. MIP Brass Compression
LTWFITTING 5/8 in. O.D. Comp x 3/8 in. MIP Brass Compression
LTWFITTING 5/8 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF6810605 - The Home Depot
LTWFITTING 5/8 in. O.D. Comp x 3/4 in. MIP Brass Compression Adapter Fitting (5-Pack) HF68101205 - The Home Depot
LTWFITTING Brass 3/16-Inch OD x 1/8-Inch Male NPT
LTWFITTING 5/8 in. O.D. Comp x 3/8 in. MIP Brass Compression Adapter Fitting (5-Pack) HF6810605 - The Home Depot
Sioux Chief Coupling 1/8 inch Female Fitting X 1/8 inch Female
LTWFITTING 1/2 in. O.D. Comp x 3/4 in. MIP Brass Compression