PAF C.S. Manhole (950) 16″ and 20″

Sturdy manhole suitable for non-specification applications.  Provides pressure actuated venting through the 10″ fill opening .  Normal vent is provided with the #37X.  Emergency venting thru the 10″ fill opens at 3 PSIG and goes to full open at 5 PSIG.  At 5 psig the 10″ fill vents 240,000 SCFH.  Standard gaskets are NC757 with other materials available.