if its not leaking, and its pipe thread, the coupler should be fine. The blue plastic plugs are known to break. Remove the whole fitting and heat it up with a torch to melt the plastic out of the fitting, you can chase it with a 7/16(IIRC) tap, install a new plastic plug and put back in the block. The used to just use a 1/4npt to 1/8npt reducer with a 1/8 npt plug. The sell some nice all brass drain plugs but the cost a little.
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