Side Block Rebuild Kit for all Kirby Morgan Dive Helmets. The side block on your helmet or mask should be serviced regularly to ensure reliable operation. The side block should be periodically disassembled and lubricated with silicone grease. At a minimum we suggest you service the side valve at least once a year or every 400 operating hours whichever occurs first. Tools required: 1. 916 inch Open End 2. Torque Wrench Attachment 3. 1316 inch Open End 4. Torque Wrench Attachment 5. 1116 inch Open End 6. Torque Wrench Attachment 7. O-ring Removal Tool 8. Torque Wrench.