1.Material: our hose connector coupling kit is made of quality plastic material that assures durability and longevity; The material is tough, corrosion resistant and not easy to deform or break even in a swimming pool water environment 2.the hose connectors are suitable for 1-1/2” and 1-1/4” vacuum hoses, filter pump connection hoses and larger pumps, making it applicable for smaller in ground pools as well; The hose B adapter is designed for 1-1/2" hosing, making it versatile and functional for your pool needs 3.this hose connector coupling kit includes 3 pieces of 1-1/4" or 1-1/2" hose connector coupling that are suitable for connecting 2 hoses of the same size or different sizes; You can use them to connect either 2 pieces of 1-.