Why do they put those stupid bulb carburetor gasoline primers on small engine motors?

Starting fluid if you're careful. Larger gasoline engines had chokes to cut the air flow to do the same thing a primer does. Enriching the air/gas mixture is the goal. Is the air intake on your engine easily plugged? Stick a sock in itas they say.

That's surprising because I checked in the owners manual parts list and they're $25 each. Do the ones on Amazon fit everything? How do they know?

Follow the carburetor science:

Mine (Toro) still works after 25 years. Maybe you just bought a cheaply made mower?

That's how I know they're $25 each, at least from the manufacturer.

They're not just the bulbs. They have a black plastic clip. And two different length hoses (one for the incoming fuel & the other to the carb).

Are all the bulbs are the same when they have those black clips & 2 hoses?

Thanks for your help. I replaced the bulb which had a long and short hose connection and which had to be broken out of the chassis to disconnect.

It's all back together now though, so I appreciate your advice. The old bulb was so yellow I forgot these things are supposed to be clear.