Push Coupling5/16x5/16 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 Features 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, sold These fittings are lead-free compliant, corrosion resistant, and are compatible with PEX, polyethy Approved applications include: water filtration, reverse osmosis systemss, ice makers, home/office USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.