Jardin Muffler Air Stone Connector 2-Piece Brass Underwater Air Stones for Aquarium Product Name : Air Stone Muffler; Suitable for : Aquarium, Fish Tank Color : Brass Color; Material : Brass Screw Thread Diameter : 9.5mm/3/8"; Import Inner Diameter : 3mm/1/9" Total Size : 3.5 x 1.4cm/1.4" x 0.6"( H x Max Diameter); Net Weight : 17g Package Content : 2pcs x Air Stone Muffler