Core inner diameter: 3" Bore: 1.254" / 1.252" (1-1/4")Securing Method: Split Clamp - Front Flange: NoRear Guide Flange Holes: No Air Connection Type: Valve - A-1597Air Connection Location: Front (chamfered end) , parallel to bore Leaf length (B), Overall (A): 12.5" , 15.062"