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Invisible confirmation

These portholes are double glazed, making them less sensitive to condensation. These models have 2 equal inox edges so there is no confirmation. The 2 rings should be glued or sewn.
Porthole
Porthole B2000 350 mm + double transparent safety glass
Porthole B2000 400 mm + double transparent safety glass
Porthole B2000 300 mm + double transparent safety glass

Invisible confirmation

These stainless steel portholes are double glazed and have no visible attachment.
Due to the double glass, there is less strain of condensation, which means that these portholes can also be used outdoors.
It concerns high quality stainless steel pore gates.