Cylinder – Only available in 2.5" size.  Barrel and endcaps are made of glass reinforced nylon, which has been polished on the inside before use.  Shaft, nuts, springwashers,
bolt, valves and bushes are made of stainless steel. Cup – Polyurethane, the rest of
stainless steel or plastic. Valves are polished so that they can be sanded if they no longer lock tight.  Cylinder consists of two o-rings (at the top and bottom of end cape) to ensure that system is waterproof.  The standard thread of end caps 1½" or 40 mm (female) and the shaft is 12mm standard – with a locknut.
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