Mounting gland. Versatile adapter slips on any Series 160, 5/16" standard pitot tube made after Dec. 1990. Two-part stainless steel fitting slides over tube and provides permanent, secure mounting.Mounting gland. Versatile adapter slips on any Series 160, 5 16" standard pitot tube made after Dec. 1990. Two part stainless steel fitting slides over tube and provides permanent, secure mounting. Where duct interior is accessible, use the washers and jam nut supplied. For blind applications or in thicker materials, use model A 156 flange mounting plate. Once tube is adjusted to proper depth and angle, tighten smaller hex bushing to lock position.