- Design incorporates pressure and vacuum relief
- 20″ and 24″ roof manhole
- “Self-energizing” Expanda-Seal diaphragm assures a tight seal
- Reduced maintenance costs
- No unbolting of vent for gasket replacement or tank examination
94221 Emergency Vent & Manhole Cover (Pressure & Vacuum)
The Shand & Jurs 94221 Emergency Vent and Manhole Cover provides emergency relief of excessive internal pressure and vacuum beyond that provided by tank conservation vent requirements.
This weight loaded vent utilizes Expanda-Seal diaphragms which provide tight seals between pallets and seats. Special diaphragm materials are available for vents subjected to severe low temperatures or used on tanks storing heated stock. Corrosion resistant pressure/vacuum seat is standard.