It best equipped with triple seal o rings and are extremely durable and beautiful, and it will simply enhance your hydro system. Our products have been regarded very attractive and top quality products by many users. The kit includes the following. 1 A pair of 6" cylinders (FAT), with a lock-in screw to secure the cap, blew proof, hardened shaft, triple seals O rings & split O rings, glossy black, t he cast of cylinder diameter is 1-5/8". The gross length is 9.75 inches when the cylinder collapse. It can be extended 6. 2 Two elbows 3/8 to #6 jic. For other sizes of this color cylinders ...