Eight-stage, single-port, double-acting, nested telescoping cylinder features bore sizes of ¾ to 4 in. and is constructed of hard-anodized aluminum tubes, plastic pistons with O-ring seals, and plastic rod bearings. It is prelubricated for dry clean air up to 150 psi and is 100% repairable. Ergo-Help Inc., (847) 593-0722, www.ergo-help.net.