Method of forming a monolithic element including multiple conduits

A method of forming a monolithic element including multiple conduits, the method comprising the steps of

• locating a parison in a closed blow mold cavity defined by opposing first and second first-stage mold dies and opposing first and second second-stage mold slides,
• orienting a flat surface on the first first-stage mold die to face toward the parison and a curved surface on the second first-stage mold die to face toward the parison and the flat surface,
• arranging the opposing first and second second-stage mold slides to move toward and away from one another along the flat surface of the first first-stage mold die in a space provided between the first and second first-stage mold dies,
• inflating the parison to engage portions of the second first-stage mold die and portions of the first and second second-stage mold slides to assume a first shape, and
• moving the first and second second-stage mold slides toward one another along the flat surface of the first first-stage mold die to pinch the inflated parison between the first and second second-stage mold slides to establish in the closed blow mold cavity a first conduit between first portions of the first and second second-stage mold slides and the curved surface of the second first-stage die, a second conduit between second portions of the first and second second-stage mold slides, and a web connector interconnecting the first and second conduits to establish a monolithic element including multiple conduits between third portions of the first and second second-stage mold slides.