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For NPT and UNF PortsAvailable in multiple materials, use the following plugs to seal unused manifold and bottle cap ports. Options for NPT ports are 1/8”, 1/4”, 3/8”, and 1/2” NPT, and should be wrapped 3-4 times with PTFE tape for leak-resistant connections. Bottom-sealing UNF thread options include 1/4-28 and 5/16-24, and do not require PTFE tape. Part numbers ending “X” denote a pack of 10 plugs.