I wanted to clean out the threads on this tee, there is some slight corrosion and crud.
it's a 1/2" fitting, Is it a 1/2" NPT thread?
On the other hand seems like a $20 tap may be over kill, is there a way to clean up the threads well, e.g. using another male fitting with slots cut into it. A PVC fitting is going to the bottom and currently from the plug I installed I know it is not leaking, maybe cutting the threads will make it worse?

it's a 1/2" fitting, Is it a 1/2" NPT thread?
On the other hand seems like a $20 tap may be over kill, is there a way to clean up the threads well, e.g. using another male fitting with slots cut into it. A PVC fitting is going to the bottom and currently from the plug I installed I know it is not leaking, maybe cutting the threads will make it worse?