SEQUENTIAL VAPOR VENT

Description

Use:
– For 16″, 20″ manhole, with thread mounting ring

Features:
– Any necessary maintenance is easy to perform

Construction:
– Rugged cast aluminum

Installation:
– Can be installed to open in sequence with another pneumatically controlled device such as the emergency valve, or open independently by simply plugging the lower of the 2 ports (use a 1/4″ male NPT plug)