Collapsible or adjustable pushrod tubes are in our opinion meant as a temporary replacement for a damaged or excessively leaking pushrod. We always recommend replacing the pushrod tubes with single piece, factory style replacements when possible. We do know that sometimes pulling the engine out and removing a head to replace the tubes is not always practical so 2 piece push rod tubes do have a place. The EMPI Billet Aluminum Hi-Performance Push Rod Tube is the best sealing collapsible pushrod tube we have come across. The spring loaded tube has dual O-ring seals between the 2 aluminum sleeves and uses stock style VW pushrod tube seals at the head and engine. At the cylinder head, the pushrod tube has an inside diameter of 7/8 inches for push rod clearance. The high performance spring loaded aluminum pushrod tube includes the 2 aluminum sleeves, spring, O-rings and tube seals and will replace 1 stock style VW pushrod tube. The push rod tube fits 1300 - 1600 based Type 1, 3 and upright Type 2 engines.