See pic. These connect the Dellorto 14.12 carbs to the air box on the Tomos peds where you have to pivot the engine down to remove the carb. Even new they are stiff and hard to fit. After a few months they get stiffer and fit even worse. Heating with a hairdryer gives them some flex but I'm hoping to find a more flexible version that actually works well. I like to use the air box as it quiets the motor and without it I'd suspect a leaner mix coming in the carb.