replace corroded valve for engine block coolant drain

I recently tried replacing the coolant in my 2014 V6 Tacoma, and realized the valve for draining coolant from the engine block looked different. The bolt, which serves as a valve, looked more green and maybe smaller than the valve on the other side of the engine block. Against my better judgement, I loosened it a 1/4 turn and realized it would not tighten back. This could have been a disaster if the drain was stuck permanently open, but luckily no coolant came out the drain and my intention is to leave it alone indefinitely.

This is part warning to those with corroded engine block drains and part question. Is it viable to replace this valve? I don't intend to try unless it starts to leak. From what I gathered, it's a brass piece that screws into the engine block and seems to operate like a needle valve. What would the part number be for this part?

 

Yes, you can replace the drain cock. I have done so. Part No 90910-09129

 

Thanks!