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• Two styles allow fastening through valve covers (No. 22637) or threaded directly into lifter valley (No. 22636)
• Vacuum relief point is adjustable by shimming an internal spring to get the precise amount of vacuum desired
• Can be disassembled for easy cleaning and maintenance and works with any vacuum level
• They are made of 6061 T6 Billet aluminum and have a clear, attractive finish
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