Flameproof Exd / Increased Safety Exe / Dual Certified ATEX - IECEx Insulated adaptors. For converting dissimilar or similar thread forms or thread sizes and insulating cable gland entry from the equipment. M20 to M75 as standard.Other parallel thread options available on request, including BSPP, PG, ET and NPSM. Male and Female thread entries are the same. NPT threads can also be supplied in sizes ranging from 1/2" to 3".