I needed to replace the vacuum hose valve on my 50cc scooter and have heard that the manual option is the best way to avoid replacing the automatic version. Most of them were made to fit much larger pipes than I have on my 50cc engine. It's the right size! While it works well and feels solid (it can be rotated 360 without damage), it's also a bit tight to rotate. holding it somewhere, or the force it takes to turn it can snap your pipe connections or even rip old dry pipes.
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