It is hardware for sealing the end of your copper pipeline. Advantage: The copper pipe fitting is made of copper material, has stable performance for long service life, and has good thermal conductivity. Specification: Material: Copper; For use with 3 Inch nominal diameter copper pipe; Inner Diameter: 79.4mm( 3-1/8 inch); Thickness Whether you're looking for standard fittings or custom solutions, we have the expertise and experience to help you find the right products for your project. As a professional of copper pipe fittings, we offer a wide variety of options to meet your needs. SUPPLY GIANT GDSD0334 Copper Fitting Reducer with Male Connect and Female Sweat Socket, 1 X 1/2 Free delivery and returns on all eligible orders. Shop PATIKIL 3-1/2" Copper Pipe End Cap, 1Pcs Copper Fitting Cap Sealing Sweat Plug Solder Connection for Plumbing HVAC Air Conditioner Thank you for considering us as your trusted source for copper pipe fittings! Specification: Material: Copper; For use with 3-1/2 Inch nominal diameter copper pipe; Inner Diameter: 92., 08mm( 3-5/8 inch); Thickness: 3mm/ 0., 12inch; Total Length: 51mm/ 2., 01 Inch; Packing List: 1Pcs x Copper Pipe Fitting Have a good performance on transferring the Heat. Copper Sweat Plug PATIKIL 1/2 Inch ID Copper Pipe End Cap, 8 Pack Copper Fitting Cap Sweat Plug Solder Connection For Plumbing HVAC Air Conditioner, Copper Tone Copper Solder Cap Instruction: Cleaning the connection surface, and then soldering to install.