Becetel vzw - Belgian research centre for pipes and fittings · ISO 4427 ISO 4437 NBN EN ISO 15494...
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Becetel vzw - Belgian research centre for pipes and fittings · ISO 4427 ISO 4437 NBN EN ISO 15494 DVGW GW335-A2 / -B2 / - 132-131 DIN CERTCO ZP 14.3.1 G / TW / AW / DA ISO 4437-4