Connectors for mending or extending standard airline hose; They are made of plastic material for long time use. This Aquarium Tube Connectors set including 8 outlet hose straight connectors; Straight Connectors Dimension (Each One): Inlet Dia 9mm/ 0.35" Outlet Dia 5mm/ 0.2" Connectors allow you to create more outputs. They are excellent for use with dual outlet pumps. Total Weight : 29g Package Included: 2 x Connectors Filters for mending or extending standard airline hose.They are made of plastic material for long time use. This Aquarium Tube Connectors set including 8 outlet hose air connectors. Durable plastic construction, 1 inlet 8 outlet design, fit for connecting most of fish tank air pump."