The 3/4 BSP Hop Filter is for the 3/4 BSP cask tap. The Hop Filter also works as a seal/ washer to stop any leaks.
Beaumont 3/4'' Hop Strainer Beer Tap Filters with Leak Proof Seal - Pack of 10
Beaumont 3/4'' Hop Strainer Beer Tap Filters with Leak Proof Seal - Pack of 100
300 Micron Stainless Steel Homemade Brew Beer Hop Mesh Filter Strainer #1 10 X
Tiiyee 30cm Beer Hop Filter Stainless Steel Homebrew New Other
300 Micron Stainless Steel Homemade Brew Beer Hop Mesh Filter Strainer with Hook
Kettle Dry Hopper Hop Basket Hop Spider Homebrew Hop Strainer Mesh Beer Filters
