This Sioux union is commonly used in gasoline, grease, oil, water, vacuum and air line applications to join pipes and tubes together. It is made of
Union - Brass - 3/8 x 3/8 - Tube x Tube
MiniRester, 3/8 O.D. Compression x 3/8 O.D. Female Compression No Lead.
660-GTR1B Sioux Chief MiniRester, 3/8 O.D. Compression x 3/8 O.D. Female Compression No Lead
Proline Series 3/8-in x 1/2-in Threaded Adapter Fitting in the Brass Fittings department at
SIOUX CHIEF Compression Nut with Insert - Brass - 1/2 909-071601
660-GTR1 SIOUX CHIEF 3/8 COMP MINI-RESTOR
Sioux Chief 3/8 inch x 1/4 inch Lead-Free Brass 90-Degree Compression x MPT Elbow
Brass Reducing Branch Wye Pipe Fitting, 1/2 Male NPT x 3/8 x 3/8 Female NPT
Sioux Chief 646-C MetalHead FBC Sytem Compatible No Lead Brass Straight Adapter, 3/4 MIP : Sports & Outdoors
Sioux Chief 1/4″ x 1/8″ Lead-Free Brass MIP x FIP Hex Bushing – Jamaica Plumbing
AQUA-DYNAMIC Max Adapter - Brass - 3/8 - No Lead 3993-915
Sioux Chief 3/8 inch x 3/8 inch Brass Barb x FIP Adapter
LTWFITTING 3/8 in. O.D. x 3/8 in. O.D. x 3/8 in. MIP Brass Compression Branch Tee Fitting (5-Pack) HF726605 - The Home Depot