blocks of PB-4555/ PB-6080 series are meant for distribution of lubricant delivered under pressure by a pump to various lubrication points in sequence-one after another. If any of the lubrication point is blocked the progressive block will stop functioning. With suitable monitoring device, this blockage is sensed and suitable warning is given to avoid running the machine without proper lubrication system. Secondary blocks can be connected to output of a progressive block for further distribution of the lubricant. These blocks can be used for following kind of Centralised Lubrication Systems :