The specification describes a manifold for use in a tip section of a multi-viewing elements endoscope. The manifold has: a first section attached to an elongated second section, where the proximal section has a proximal socket and the distal section has a distal socket； a groove having a first portion along a first axis parallel to a longitudinal axis of the manifold, and a second portion along a second axis tilted at an angle to the first axis； and a working channel tube wherein a distal segment of the tube extends along the first axis to lie within the first portion of the groove, and where a proximal segment of the tube extends along the second axis to lie within the second portion of the groove.
