Plugs are intended to seal unused manifold and bottle cap ports.

Port Plugs for NPT and UNF ports are available in multiple materials, and are designed to seal unused manifold and bottle cap ports. Bottom-sealing UNF thread options include 1/4-28 ports and 5/16-24, and do not require PTFE tape. Options for NPT ports are ¹/₈", ¹/₄", ³/₈", and ¹/₂" NPT. Plugs should be wrapped 3 to 4 times with PTFE tape for leak-resistant connections.