Bo stitch BTFP72318 Industrial 1/4" Series Plug - 1/4" NPT Male Thread; features pre-applied thread sealant for airtight connections - this simplifies field installation by eliminating the need for thread sealant tape. Designed with corrosion resistant plated steel construction with drag guard for jobsite durability and reliability. The 6-ball coupler design is for balanced, strong, secure connections