1/4" NPT(F) (National Pipe Thread) thread coupler for air compressor and air powered tools. Corrosion-resistant steel for long life. Hardened stainless steel locking balls for maximum performance with drag-guard for durability and reliability. Pre-applied thread sealant for airtight connections. Simplifies field installation by eliminating the need for thread sealant tape. Balanced, strong and secure connection.