Purchased on Amazon, but it's the wrong size, so it's a new, unopened, unused item. Size: 3/8 inch Material: Plastic Brand: CESFONJER Color: Blue, White Connector Type: T-Shape Exterior Finish: __ ★ 100% safe food-grade material, 100% leak-free, 100% reusable ★ Package: 5 pieces of 3/8" L-type water filter fittings, 3 pieces of 3/8" T-type water filter fittings, 2 pieces of 3/8" shut-off valves, 3 pieces of L-type connectors 1/4" to 3/8" fittings, 5 meters of 3/8" water supply pipe, and 1 tube cutter. Sufficient quantity to meet various needs. ★ Easy to install: No tools required, easy to install. ★ 5 meters of 3/8" / 6mm inner diameter tube, quick connect fitting 3/8" RO water system. ★ Applications: Includes RO systems, beverage dispensing, refrigerators, ice makers, coffee machines, etc.