Honeywell 15PA258 Switches: Accessory, Toggle Switch Sealing Ring For Use With Any 15/32-32 UNS-2A Threaded Bushing Toggle, Corrosion Resistant 1.57 mm Steel Cup Washer With Keying Tab, Silicone Elastomer Lining Both Sides of Cup Washer, Military Part Number M5423/16-01