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The PMK-5 (Russian: Противогаз Mалогабаритный Kомбинированный — "Compact Combined Mask"), designated as the GP-21 for civilian use, is manufactured in the Russian Federation by Tambovmash, and is the fifth mask in the PMK series.
The PMK-5 has a flexible lens, bonded to the mask (comparable to the MCU-2).
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, a orinasal cup, and a voice diaphragm. The exhale valve and voice diaphragm are structurally identical to those found on preceding PMK-series masks.