AXIS Communications TQ1917 ADAPTER M25x1.5-3/4 NPT, 02761-001 Explosion-protection certified "Ex d" M25x1.5 to 3/4" NPT nickel-plated brass thread reduction adapter. Worldwide certifications for use in Class I/II/III Div 1, Class I Zone 1, 21 and Zone 1, 21.