Product Name : Aquarium Air Valve;Material : Metal, Plastic;Color : Silver Tone, Black * Small One Valve Outlet Dia : 3.4mm/ 0.13";Small One Valve Inlet Dia : 3.4mm / 0.13" * Large One Valve Outlet Dia : 3.4mm/ 0.13";Large One Valve Inlet Dia : 3.4mm/ 0.13" * Small One Overall Size : 30 x 21 x 8mm / 1.2" x 0.84" x 0.32"(L*W*H);Large One Overall Size : 34 x 29 x 22mm / 1.4" x 1.1" x 0.85"(L*W*H) * Net Weight : 37g;Package Content : 4 x Aquarium Air Valve