Metric The Lapped Flange Connector is used to allow safe and easy connections between process lines and instruments. The basic, one-piece unit consists of a HOKE Gyrolok tube connection end and a 1/2” lap joint pipe flange. The flange end is dimensioned to meet “ANSI 2500” flange specifications. Available in “Smooth” or “Serrated/Concentric” seal faces, and in 316 Stainless Steel or Monel.