Pin index for Air is: (A) 1,4, (B) 2,5, (C) 5, (D) 1,5
Answer is D. PIN index number prevents wrong fitting of the cylinders . AIR - 1 ,5 02 - 2 ,5 N20 - 3 ,5 CO2 - 1 ,6 ; 2,6(Liquid) Cyclopropane 3 ,6 Entonox 7