Seals with water flow become porous and cracked after several years. Then they can no longer do their job, become leaky and let water through. At the latest when this happens, you should replace the seals. The set contains common sizes and reliably seal threads. It is best to replace the seals before they become cracked. Gasket assortment rubber Contents: 4x 3/8", 4x 1/2", 2x M22x1, 2x 3/4", 2x M24x1, 2x M28x1.