A combined debris catcher and pressure relief valve positionable between first and second ports of an inlet arrangement that is upstream of the main body of a vacuum pump. More particularly, the present invention relates to a process for the preparation of trans-tetracos-15-enoic acid, which is a bioactive constituent possessing dose-related hepatoprotective activity. The neck includes a lower mounting portion with a second profile complementary to the first profile of the neck-receiving slot and at least one lateral locking member receiver complementary to the at least one lateral locking member receiver of the deck. As a result, the first remote-control signal light and the second remote-control signal light can be made to traverse the same optical path as that of the sensed light from the subject.