A3716.21 is a synthetic enlarging fitting designed to adapt between different Pg thread sizes in cable management applications. Constructed from glass fiber reinforced polyamide, this fitting features a Pg 16 outer thread and Pg 21 inner thread configuration. It offers IP 54 protection class as standard, upgradeable to IP 68 when the entry thread is sealed. The fitting operates within a temperature range of -20°C to +100°C and has a wrench size of 32 mm for easy installation. This enlarging fitting is ideal for industrial and electrical installations where thread size conversion is required between cable glands and enclosures.