Boat Leveler hydraulic cylinders are made of fiberglass-reinforced, impact-resistant nylon which eliminates expansion from hydraulic pressure and water absorbtion, and makes them UV resistant.
Two expanding type seals, plus an O-ring eliminates low and high pressure leaks.
A tubular steel insert in the cylinder fitting prevents breakage due to hitting logs, ice, or any other objects in the water.
In addition, simple nylon cylinder pins mounted to the top and bottom of the cylinder are designed to act as shear pins if a submerged object is struck.
Thus, if a problem does occur with the cylinder, the boat does not have to be hauled out for cylinder changes.
Swivel brackets on both ends enable the cylinders to be mounted on any angle including 90°, this means no blocking or shimming is needed for transoms which are not perpendicular to the bottom of the boat.
Stainless steel springs retract the cylinder when the boat is not in motion.
Improved barb connections prevent hoses from blowing off -- the harder you pull, the tighter they hold.