Man, just when you think you have seen it all. Here’s the setup, went to change oil yesterday plugged my 5/8” hose to my quick drain and, dribble, at best. I had dinner commitments so I left it to drain for the night. Returned to the plane today, maybe a quart has come out and nothing flowing, *#”%#&@*$! So now drop lower cowl, remove quick drain. Now, I have never seen one of these before so once out, I pushed it up. At first I thought there was a brass check ball in there. Started washing the valve off in gas and what I thought was check ball is in lots of pieces. At first I though “oh no!” Brass, bearing coming apart. But on closer inspection I realize it’s bits of leaf and/or insect! I realize the entire tube is filled with it. I eventually got it all out, did my best to feel around bottom of pan for more, didn’t see any.
Two nagging questions. 1. How in the world did a leaf get in my oil pan.
2. If quick drain was full what else? Oil pickup screen, any return line screen, I have a spin on filter, I assume this means the original oil screens were removed?

Could your hose have been loaded with this trash and contaminated the valve...

No, and the whole 2” of the quick relief tube was full of this

Some kind of insect made a nest in your quick drain tube, probably a bumble bee. Around here I have leaf cutter bees in my fuel tank quick drains every summer, I made a tool out of safety wire just to remove them.

Now that makes a lot of sense, all the pieces of leaf were approximately the same size. Plus now that I think about it from the moment I pushed up the quick drain plug it was clogged, the leaf matter was already there. So logically it didn’t come from the inside, but was pushed into the tube from the outside. (Casting a wary eye at my various hangar mates )