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These are the best things since sliced bread. You just pull a little lever to drain the crankcase oil. Keeps the dirty oil from running down your arm and splattering into your eyes.
Got the one on my current Expy from #####.com for about $15. I had one on my last vehical and let it get away (sold) before I swapped the valve off, took me about a month to find a vendor to get a new one. This makes oil changes a little easier and a lot cleaner.