If you looking for adapator between std. pump connector with 1.25" -12 tap to your garden hose, this adaptor will fit to your standard garden hose adaptor with the 3/4-10 threadFor example , if you need to empty your pool, it shoud fit to your pool inletThe STL model is already tested - I printed this adaptor and use it to empty my pool.

If you need other thread I can make you an STL printed model which will fit to your application