Keep your pipes protected during winter with this versatile #4 blow thru expansion plug. Designed for both 3/4 inch and 1 inch pipes, this LHBP plug features a built-in Schrader valve for convenient pressure monitoring and release. The durable construction ensures a reliable seal to prevent pipe damage from freezing temperatures. Perfect for winterization of irrigation systems, plumbing lines, and other pipe applications where seasonal drainage is required. The plug's blow-through design allows for efficient system drainage while the Schrader valve provides controlled air pressure release. Easy to install and remove, this expansion plug is an essential tool for maintaining your piping system during cold weather months. The secure fit works with standard pipe sizes, making it a practical solution for both residential and commercial winterization needs. Lamprey Hardware #4 Blow Thru Winter Plug MFG # LHBP4