Twospoons
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Looking for replacement stopcock
We have this measuring cylinder that is meant to be part of a salt-spray test chamber - but part of the stopcock is missing (see pic). Does anyone
know where I could buy a replacement part or if that bit has a specific name I could search for? Or am I going to have to cannibalize a complete
stopcock?
Helicopter: "helico" -> spiral, "pter" -> with wings
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davidfetter
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Quote: Originally posted by Twospoons  | We have this measuring cylinder that is meant to be part of a salt-spray test chamber - but part of the stopcock is missing (see pic). Does anyone
know where I could buy a replacement part or if that bit has a specific name I could search for? Or am I going to have to cannibalize a complete
stopcock?
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Both PTFE (Teflon®) and borosilicate stopcocks are items of commerce, so yes, you can get one. Just make sure it's the right kind for the
application.
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Dr.Bob
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At first glance it looks like a #2 glass stopcock. Can you measure the diameter of the left and right holes, and the length of the ground glass area?
I have some of these, if you want to buy one. But most colleges and companies have drawers of loose stopcocks in one guys lab for spares (I'm that
guy), so you might find one easily.
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Sulaiman
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I would clean that joint before trying a new glass stopcock
because it may jam up.
CAUTION : Hobby Chemist, not Professional or even Amateur
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Rainwater
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If using glass i find a little time with some grinding powder will make the new one fit perfect
"You can't do that" - challenge accepted
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Twospoons
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I'd probably go for ptfe, just because it would be less likely to stick with salt dried all over it. Just need to find somewhere to buy it. I'm in
NZ, so if theres no-one locally, then its probably Aliexpress I guess.
Helicopter: "helico" -> spiral, "pter" -> with wings
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Dr.Bob
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Most PTFE stopcocks have a different taper than glass ones. I have seen a few older PTFE ones that were made to fit glass stopcocks, but they are
rare. PTFE ones are typically shorter and have a higher taper angle or the standard ones.
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Twospoons
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I could probably just get our machinist to make one out of acetal or UHMPE. That might be the simple route.
Helicopter: "helico" -> spiral, "pter" -> with wings
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