Armstrong A8991 Seal Kit The Armstrong A-8991 Seal Kit contains all the items required to replace steam and air seals in the Armstrong C-1801 pneumatic operator and all other bonnet assemblies. When the kit is used on bonnets other than the C-1801 operator there will be additional parts left over after the repair. Note: The replacement seal arrangement may be different than the existing. Do not reuse any old seals or spacers. A silicone based lubricant on the valve stem is recommended during reassembly
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