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O.P.S.O. Sp. z o.o. is producer of polyester concrete channels brand STORA-
Arva Plastics (www.arva.be): producer of pvc pipes (range from sewerage up to sanitary and rain water disposal, and pipes in polyethylene, cable trays and electrical conduits).
Belgian foundrie, specialised in cast iron for road construction (www.fondatel.com).
Hermelock (www.hermelock.be) is producer of composite covers, made of polyurethane reinforced with fibreglass and very light considering their dimensions and load capacity. The covers can be handled most easily by one single person, without mechanical help.