Soviet PDF-D Childs Respirator

The PDF series of Respirators were designed for children who were to young to wear the GP5, it's a latex mask with straps and a hose that cannot be removed.

Soviet/Russian GP5 Respirator

The Soviet GP5 Civilian respirator is the most common mask on the surplus market and perhaps also the most famous gas mask ever made, it's a simple latex hood with two lenses and a filter intake and outlet valve at the bottom. Chances are if you see a TV show or film using cheap gas masks, they'll use the GP5.

Soviet GP4 Respirator

The Soviet GP4 respirator was issued to civilians from the 50s to the 70s. It was later replaced by the GP5 respirator which was to become the most mass produced respirator in World history.
The GP4 has appeared in much of the Artwork for the STALKER series.
The GP4 has a hose that can not be detached from the main body of the mask, it takes a 40mm filter at the bottom of the hose.

World War 2 Nazi Germany DM40 Civillian respirator

One of the first masks to take a 40mm filter. The DM40 was issued to the civilian population in Nazi Germany during world war 2 in case of chemical weapon attacks.
The mask features a Reich Eagle stamp and is made of a surprisingly good quality rubber for the time.