All COF cylinders are supplied with a smooth hollow saddle and have a centre hole, thread on the body, in the rod and in the base to mount them easily and enable them to be used with accessories. A safety valve connected to the retract chamber prevents any overpressure. The end of stroke nut has a wiper to prevent the ingress of dirt. The anti-corrosive nitride treatment makes these cylinders suitable for use in harsh environments and in the open air.