4" Tri Clover Ferrule - Long Long ferrules are typically welded into a vessel wall or lid like a Hot Liquor Tank, Mash Tun or Boil Kettle. If you're welding it to tubing, then you would ususally use a short ferrule. Ferrule wall is .065".  This ferrule is great for welding to the top of a fermenter to make an access port for dry hopping or pitching yeast.

1.25" OAL.