Highlights:End 1 Diameter: 5/16"End 2 Diameter: 5/16"Polly alloy is an efficient way to join multiple different materials with no specialty tools, solder, unions or glue requiredThese fittings are lead-free compliant, corrosion resistant, and are compatible with PEX, polyethylene, nylon, polyurethane, copper, brass or mild steel tube (soft)Approved applications include: water filtration, reverse osmosis systemss, ice makers, home/office coffee and beverage dispensing equipment, aquariums, air, gases, vacuum and liquids