Hydraulic cylinder head are usually made from metal alloys or plastic in order to withstand the high pressures generated by the hydraulic fluid inside of them. The shape of the cylinder head is also critical to the operation of the cylinder. Cylinder heads typically have two or three ports through which fluid can enter or exit the cylinder bore during operation. These ports are sealed off by plugs when not in use to prevent dirt and contaminants from entering the system and damaging it. In some applications, the ports may be angled to increase the efficiency of the hydraulic system by reducing frictional losses in the fluid flow and increasing the force that the cylinders can generate. You can buy from link below – https://www.totalperformance.net.au/DRP-LS-EXHAUST-HEADER-MANIFOLD-MLS-GASKET-HOLDEN-COMMODORE-HSV-VT-VX-VU-VY-VZ-VE-VF-LS1-LS2-LS3-GM-12617944 Direct Approach – 1800 351 351 or (03) 9362 0266