Manhole Tools: Equipment: Shields 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. All aluminum fabrication.
Model Description Weight
2730-8A (27" or 30" dia.) 8" High
(68.5cm or 76cm) × 20cm		 17 lbs
(7.7 kg)
2730-12A (27" or 30" dia.) 12" High
(68.5cm or 76cm) × 30.5cm		 20 lbs
(9.0 kg)
3336-12A (33" or 36" dia.) 12" High
(84cm or 91cm) × 30.5cm		 24 lbs
(11 kg)
2750 Inner Tube Replacement 2 lbs
(.90 kg)