PLEASE NOTE:WE ORDER THESE ITEMS AS WE GO ALONG, SO WE NEED TO CHECK FIRST TO MAKE SURE THERE IS AVAILABILITY. PLEASE EMAIL US BEFORE YOU PLACE YOUR ORDER . MANY THANKS IN ADVANCE.WATERWORLD SPORTS All the necessary components to have a complete service carried out on a Beaver Twin Manifold Cylinder Valve with Central Isolating Tap to ensure it remains in perfect operational condition. 2 X 14R Large O-Rings for the M25X2 threaded section between the Cylinder and Valve, 3 X 4R Spindle O-Rings, 3 X 5R Split Spindle Washers, 3 X 6R Spindle Washers, 3 X 7R Bonnet/Body O-Rings, 3 x 2R Valve Seats, 3 X 15R DIN Insert/Regulator O-Rings, 4 X 19R Centre Section O-Rings & 3 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. Please refer to the Technical Drawing that can be found in the Documents & Downloads section for the relevant type of Cylinder Valve. Please see Product Code CVSK for Single Cylinder Valves.