This style eliminates the need for jam nuts by using a strong spring to provide tension on the seal. Made of tough aluminum and anodized for long life. Supplied with seals The spring loaded design also allows you to quickly change damaged or leaking push rod tubes with the engine in the car. The heavy duty spring keeps a constant tension for a positive seal. Made from heavy duty aluminum and fully blue anodized for good looks and protection from the elements. Fits 1200-1600cc. Material: Aluminum Type: Spring Loaded Quantity: 8 PiecesPush Rod Tubes Spring Loaded 8 Pieces