CMP 737 Adaptors & Reducers are globally approved explosive atmosphere cable / conduit accessory. 
Overview of the 737:
Used for thread conversion
Globally marked IECEx, ATEX, UL & cCSAus 
EX e, Exd and Exta
BS6121:Part 1:1989, IEC 62444, EN62444
| Superlec Code | M63F50R | 
| Male Size | 63mm | 
| Female Size | 50mm | 
| Material | Brass Exd/Exe |