20J and 20K
Posted: Sun Oct 04, 2020 4:41 pm
How do you tell the difference between a 20j and 20k valve cap if you have neither instrument to try them on.
all the same parts for both.
Guide pins for valves #'s 1, 2, and 3 are propriety, but still the same for both the tuba and the sousaphone.
Of course, the pistons are NOT the same.