All the necessary components to have a complete service carried out on a Beaver Single Cylinder Valve to ensure it remains in perfect operational condition. 1 X 14R Large O-Ring for the M25X2 threaded section between the Cylinder and Valve, 1 X 4R Spindle O-Ring, 1 X 5R Split Spindle Washer, 1 X 6R Spindle Washer, 1 X 7R Bonnet/Body O-Ring, 1 x 2R Valve Seat and 1 X 15R DIN Insert/Regulator O-Ring & 1 X 17R Body/DIN Insert O-Ring that are not required for the 300 Bar OR M26 versions. All O-Rings are manufactured from high quality Viton, suitable for use with Nitrox after O2 Cleaning in addition to normal breathing air. Cylinder Valve Servicing should be carried out annually and must only be carried out by a trained and certified SCUBA Technician.