Abstract: A locking device comprises a locking pin and a base with bore for receiving the locking pin. The base has resilient locking means movable between a locking position where it engages a detent on the pin and an unlocking position. A slide or like means aids movement of the means between the two positions.

Abstract: A face mask comprising a substantially planar valve block having a first aperture therethrough containing an inspiratory valve and a second aperture therethrough containing an expiratory valve. The face mask also includes a support member, and a facepiece comprising a flexible, molded member having a substantially planar face of substantially constant thickness and with two apertures therein aligned with the first and second apertures of the valve block. The substantially planar face acts as a gasket between the valve block and the support member.