All items in the Beduan Pneumatic composite range are silicone-free. Pneumatic Coupling Pneumatic Rotary Coupling PE Series Union Tee Pneumatic Fitting - Air Fittings And PAR Ker Air Three Way Pneumatic Connector Beduan Pneumatic fittings are compact instant fittings. Body material: Plastic (PET). Temperature range: 0-60 ° C | 32 ~ 140 ° F. Pressure range: 0-145Pai (0-1Mpa)., Maximum pressure: 217 psi (1., 5 MPa). Size: 6mm OD tube. Tube size: 4 mm OD x 4 mm OD The stainless steel clamp ensures excellent tube retention while the D-seal seal seals on the OD of the tube, in static and dynamic position, thanks to an optimised design of the mounting cavity. Eagles 6mm Union Tee Push To Connect Fittings, 6mm x 6mm x 6mm 304 Stainless Steel Quick Connect Fitting 3 Way Union Tee Air Fittings - 2 Pack PE6 SNS PE Pneumatic Union Tee Air Fitting 6mm 8mm 10mm 12mm Tee Connector Push In Push Lock Fitting... Round O-Ring: It offers a 360° rotation. 10PCS 6mm Pneumatic Tee Union T Shaped Connector T... - Vicedeal The O-rings are made of nitrile. Even after installing the tube, a 360 ° rotation could work.