Jardin Plastic 4-Way Air Control Valve for Aquarium Product Name : 6 Way O2 Valve; Material : Hard Plastic Size : 8 x 5.8 x 2cm/3.1" x 2.3" x 0.8"(L x D); Inlet Outside Diameter : 8.5mm/0.3" Outlet Outside Diameter : 5.5mm/0.2"; Color : White Weight : 11g Package Included : 1x O2 Valve