Connection mechanism between valve and joint in air piping

A connection mechanism between a valve and a joint configured to connect a tube through the joint to a housing of the valve in the air piping,

• wherein at least one of the housing of the valve and the joint is made of a resin,
• wherein the housing of the valve comprises a connection hole configured to accept insertion and connection of the joint, and an engaging member insertion hole which is drilled from an external surface of the housing in a direction orthogonal to an axial direction of the connection hole, and penetrates through the connection hole, and
• wherein the joint comprises an annular groove formed along a circumferential direction of an outer peripheral surface of the joint, and in an insertion state of the joint into the housing, an engaging member being inserted from the engaging member insertion hole on the external surface of the housing is configured to pass through the annular groove disposed on the joint and come into engagement with the joint.