supply of ball valve/ drain valve 90 square mm, 1 1/4 suitable for 3-phase loco main transformer as per abb id no. hstn 422368. note: one sample should be got approved before effecting bulk supply.ball valve/ drain valve 90 square mm, 1 1/4 suitable for 3-phase loco main transformer as per abb id no. hstn 422368. note: one sample should be got approved before effecting bulk supply.,ball valve/ drain valve 90 square mm, 1 1/4 suitable for 3-phase loco main transformer as pe r abb id no. hstn 422368. note: one sample should be got approved before effecting bulk supply. [ warr anty period: 30 months after the date of delivery ] ]