Back in the day, we had a lot of these, different sizes.  I just came across this size.  

This is a Lycoming O235 290 320 360 Fuel Primer Line - 12."

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Here at CMRuggles, our goal is to sell quality aircraft parts. We have not tested this part in flight and therefore cannot guarantee the airworthiness of this particular part or any other part or item that we have listed and / or sold to you, the purchaser. This part is not warranted, expressed or implied. As always, we do accept returns for any reason. However, by purchasing this part, you, the purchaser, assumes full responsibility for its' airworthiness. We recommended that you, as the purchaser, employ or utilize a certified airframe and power plant mechanic to inspect this part for airworthiness before installation and after, and also, you, as the purchaser, perform, or supervise its' installation in any aircraft in accordance with FAA regulations.