This LTWFITTING Compression Unions are made of brass for durable. Designed for use with aluminum, copper and plastic tubing. Not for use with steel
Brass Compression Sleeve, 5/16 – AGS Company Automotive Solutions
LTWFITTING Assortment Kit Tube OD 1/8" 3/16" 1/4" 5/16" Brass Compression Union Set (40-Pack) HF62S4MIX - The Home Depot
LTWFITTING 3/16 in. Brass Compression Sleeve Fittings (50-Pack) HF60350 - The Home Depot
Dorman 1/8in Union Compression Fitting
3/16 1/4 5/16 3/8 1/2 4 6 8 10 12 15-42mm OD Tube Compression Union Brass Pipe Fitting Connector Home Garden Oil Water Fuel
STERLING Brass Compression Tube Fitting, Union, 5/16 OD (Pack of 10)
PlumbShop Brass Compression Union Tube, 5/16-in OD, 1-pk
BrassCraft 5/16-in x 1/4-in Compression Reducing Union Coupling Fitting in the Brass Fittings department at
PlumbShop Brass Compression Sleeve, 1/4 or 5/16-in OD, 3-pk
LTWFITTING 5/16 in. O.D. Comp x 1/8 in. MIP Brass Compression Adapter Fitting (25-Pack) HF685225 - The Home Depot