The Custom Hoists 4000 Series Single acting Hydraulic Telescopic Cylinder, Single acting Telescopic Cylinder. Custom Hoists 4000 Series Single acting Hydraulic Telescopic Cylinder is a high-quality hydraulic cylinder designed for single-acting applications. This cylinder features a telescoping design that allows it to extend and retract with minimal effort, making it ideal for lifting and pulling applications. The cylinder is constructed from durable materials and is designed to with stand heavy loads and frequent use. This cylinder is suitable for a variety of applications, including dump trucks, trailers, and lifting equipment. FleetPride is your First Click in Heavy Duty®.