Tender For supply of shedule no. 1: elbow equal g. i. heavy duty 90 degree 1/2 bsp threaded is: 1239-part-1 of 1990 , shedule no. 2: elbow equal g. i. heavy duty 90 degree 3/4 bsp threaded is-1239-part-1 of 1990 , elbow equal g. i. heavy duty 90 degree 1 bsp threaded is-1239-part-1 of 1990 , union gi 1 dia i. s. specn-1239 part 1 of 1970 , nipple g. i. hexagonal heavy duty 1/2 bsp threaded specn. is-1239 pt-1 of 90 (15mm) , straight coupling ( gi) 1/2