materials: The pool hose adapters are made of , sturdy and corrosion resistant plastic. The rubber ring fits snugly over the hose, creating a sealed space that prevents leaks and keeps your pump running at peak efficiency. Easy to install: Pool hose adapter allows connection of 1 .25" to a piston valve or filter pump. The smaller end connects to the 1.25" hose. The threaded end connects to a 1.5" piston valve or filter pump and simply screws on. Suitable: The pool hose adapter fits all Intex 4000, 2500, 2000 and 1500/gallon filter pumps using threaded hoses and is suitable for Intex chlorine generators and salt systems using threaded hose connections. Versatile: The pool hose adapter is suitable for hoses from filter systems, submersible pumps, swimming pool pumps, filter pumps, sand filter systems or shut-off valves. It is perfect for swimming pool connection kits to ensure safe and efficient operation of your swimming pool. Note: The data is all measured manually, please allow 1-3cm error, due to the difference of light and display, there will be a certain color difference, the actual object received shall prevail.