Aluminum Manhole Shield
All Aluminum Fabrication. Weighs 24 LBS. Pneumatic seal keeps ground water from flowing into the open manholes. Just Inflate Tube with 5-10 lbs. of Air or Nitrogen to form a Water-Tight Seal. No Clamps or Sealing Compounds required. Series 2730 (reversible 27' & 30') fits most . Communications Manhole Openings. Model 3336 (33' & 36') fits many Electric Utility Manholes. Custom Sizes are available.