A monoblock is a compact, reducing station which is used for the high-pressure range. The entire high-pressure part of a natural gas reduction station is provided by a filter with optional separating section and a heat exchanger with stainless steel pipes. A distinction is made between monoblocks with threaded connection , which are used for the limited space conditions of control panels and valve batteries and monoblocks with flange connections , which are used in applications with natural gas and aggressive media. In addition, there are monoblocks for sampling and injection processes , which have a probe for sampling and are also used for injection processes.