2" Tri Clamp CrossTri Clamp Crosses can regulate flow in several directions without using additional elbows or bends. This Tri Clamp Cross is an alternative to manifolds. This 2" Tri Clamp Cross is made from 304 Stainless Steel and is polished inside and out. DETERMINING TRI CLAMP SIZE Tri Clamp sizes are determined by the outer diameter of the pipe or tubing, not the outer diameter of the flange or Tri Clamp itself. The flange of a Tri Clamp fitting typically has