ZSh-7APN is a modification of ZSh-7AP helmet. Visually, it's identical to the ZSH-7AP helmet and differs from it only by having low-resistance speakers and plugs. It uses the same oxygen masks as ZSh-7AP helmet - KM-35 and KM-34/KM-34D.   ZSh-7APN helmet. ZSh-7APN helmet. ZSh-7APN helmet. ZSh-7APN helmet. ZSh-7APN helmet with KM-34D series 2 oxygen mask.