Image Item No. Description  23221  Pneumatic Aero Tube 32 x 3 x 2 1/3 Catalog: Parts: Pneumatic  23221  Pneumatic Aero Tube 32 x 3 x 2 1/3 Catalog: Parts: Pneumatic  4697b  Pneumatic T Piece Second Version (T Bar with Ball in Center) Catalog: Parts: Pneumatic  4697b  Pneumatic T Piece Second Version (T Bar with Ball in Center) Catalog: Parts: Pneumatic