0.5″ Barbed Aquatic Ball Valves by Two Little FishesBarbed Aquatic Ball Valves for regulating water flow through standard hose used for devices such as canister filters, pump return lines, protein skimmers, calcium reactors, etc. Hose slips onto barbed end for secure fit. Available in 4 sizes to fit 1/2″, 5/8″, 3/4″, & 1″ I.D. tubing.0.5″ Barbed Aquatic Ball Valves by Two Little FishesBarbed Aquatic Ball Valves for regulating water flow through standard hose used for devices such as canister filters, pump return lines, protein skimmers, calcium reactors, etc. Hose slips onto barbed end for secure fit. Available in 4 sizes to fit 1/2″, 5/8″, 3/4″, & 1″ I.D. tubing.Product code: 3955Item No. PL-TLF-5445W