M25 double compression exd cable gland has hole size in 25mm, it's the same size with G3/4 in inch, it's made by brass and ss stainless steel material.
BDM Series: Explosion Proof Cable Glands (IIC, E, TD), PDF, Building Materials
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M25 Double Compression Cable Gland With G3/4 Size in Inches
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Cable gland, long thread, M25, 13-18mm, PA6, black RAL9005, IP68 @ Morek
Explosion-Proof Double Compression Armored Cable Gland - China Cable Gland, Exprosion Cable Gland