Image Item No. Description  99021  Pneumatic Hose Connector with Axle Connector Catalog: Parts: Pneumatic  4697b  Pneumatic T Piece Second Version (T Bar with Ball in Center) Catalog: Parts: Pneumatic  41817  Pneumatic Technic, Liftarm 1 x 3 with Connections for Hose 44079 and Rubber Bladder 41818 Catalog: Parts: Pneumatic