Inflation is done with any conventional system (compressor, bottle, etc.) that has a pressure gauge to monitor the working pressure.The various OCO models cover the range of conduits commonly used in telephone and utility networks: 110, 63, and 40 mm (outer diameter of the conduit).
The resulting seal ensures complete airtightness against the passage of solids, liquids, and gases in a conduit (IP 68 W), while also protecting it from rodents, chemicals, and toxic agents.
It is used at conduit connections to manholes and access chambers; to protect splice areas; and at cable entry points to substations and transformers. Since it can be installed even when no cable is present, it often replaces conventional plugs.
Reopening the seal is simple: just puncture the bag. This allows for the installation or removal of cables without the need for excavation or demolition work. The installer can remove the seal, install the cables, and then reseal it with a new OCO. The fact that it is not reusable is offset by the product's very competitive price and easy installation. Since it doesn't require heat or sealing agents, it is the ideal solution from a workplace safety perspective.
The bag is made of a complex of aluminum, polyethylene, and polyester sheets that combine flexibility and strength. The bag is fitted with strips of isobutyl rubber sealant (mastic) that secure it to the conduit and cable, ensuring a complete airtight seal when inflated. Inside the bag, along the lateral border of the mastic, are two foam weatherstripping strips that prevent axial leakage of the sealant.
Air is introduced through a 2 mm diameter, 200 mm long polyethylene tube. Once the appropriate pressure (3 +/- 0.2 bar) is reached, the tube is pulled, and the resulting opening is filled with an internal gel that creates a complete seal.
