HUGRO ATEX adapter 535.11 ATEX transition pieces, from metric to PG, NPT, gas pipe (and vice versa) in brass, stainless steel or plastic HUGRO Serie 535.11 Referenz-Artikelnummer 535.11 Name ATEX-Übergangsstücke Katalog Seite 166 Eigenschaften Kunststoff Metall product overview