The fittings capture the tubing with stainless steel retainers. By suppressing the release ring (around the tubing entry port on the fitting), the tubing is easily removed. Within just a few minutes, you'll be able to disconnect and reconnect tubing. O-ring seals, and maintaining precise tubing diameter during the manufacturing process, ensures a reliable seal. For Experimental Aircraft ONLY. Applicability and suitability of this kit is the responsibility of the builder. Kit Includes: 2 x 102559-000, Static Port Alum 3/8″ NPT 2 x 102630-000, Fitting Tube Pneumatic Strt Female 1/4″ OD PTC X 1/8″ NPT 6 x 102631-000, Fitting Tube Pneumatic Strt Male 1/4″ OD PTC X 1/8″ NPT 2 x 102631-001, Fitting Tube Pneumatic Elbow Male 1/4″ OD PTC X 1/8″ NPT 25′ x 102632-000, Tube Pneumatic Polyethylene 0.17 ID X .25 OD BLU 25′ x 102632-001, Tube Pneumatic Polyethylene 0.17 ID X .25 OD GRN 35′ x 102632-002, Tube Pneumatic Polyethylene 0.17 ID X .25 OD Natural 3 x 102639-000, Fitting Tube Pneumatic Y Union 1/4″ OD 1 x 102639-001, Fitting Tube Pneumatic T Union 1/4″ OD 1 x 102641-000, Tube Cutter 30 x 102642-000, Snap Bushing 2 x 102643-000, Sleeve Alum Coupling Tube 3/16″ OD 2 x 102644-000, Fitting Alum Flared Tube and Pipe Thread 3/16″ OD