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The GP-21 (Russian: Гражданский Противогаз — "Civilian Gas Mask") is manufactured in the Russian Federation by Tambovmash.
The PMK-5 has a flexible lens, bonded to the mask (comparable to the MCU-2).
Overall it is very similar to the PPM-88 mask, albeit more recent and with a relocated filter inlet.
The PMK-5 has a six-point rubber head harness. All of the straps can be quickly adjusted, in contrast to the preceding masks in the PMK series.
The mask has two 40mm GOST inlets, with a plug for the one not in use, an orinasal cup, and a voice diaphragm directly in the front. The exhale valve and voice diaphragm are structurally identical to those found on preceding PMK-series masks.