Uflex UC128ENDCAP End Cap and Seal is a package that is only compatible with all Uflex UC128-OBF and SVS Outboard Cylinders. It features durable black and blue plastic construction designed for marine environments. Each end cap and seal kit only includes one end cap and each cylinder requires an end cap on each side. A replacement is not included and if you wish to remove the end cap and seal, a spanner wrench is required.