Symphony Limited — Water drain rubber cap leakage

Address:

RAJAJINAGAR BANGALORE

I have a symphony air cooler in my home i was purchased it from adishwar showroom from rajajinagar bangalore last year, problem is when i fill the water in that air cooler, i saw drops of water leaking in water drain cap, i just tried to correct it, but that cap quality is very bad and it went inside of the water tank suddenly fully water came outside, i just enquired many shops to get that cap, i didn't get it, i am feeling very bad, please let me know from where i can get that rubber cap,