This is the Kinney Flat HD Screw, Part# 90295C. It is made specifically for the Kinney KMBD850 and KMBD1600 mechanical vacuum boosters . This screw is used to secure critical components during pump assembly. It is a hardware part that ensures a proper and secure fit. This screw is also included in Major Repair Kits for both the KMBD850 and KMBD1600 pump models 

This is the Kinney Gear Lock Washer, Part# 5879B. It is made specifically for the Kinney KMBD850 and KMBD1600 mechanical vacuum boosters . This lock washer secures the gear assembly in place. It prevents nuts and bolts from loosening due to vibration. A good lock washer keeps your pump running safely and reliably . This part is also included in Major Repair Kits for both the KMBD850 and KMBD1600 pumps