Try PTFE plumbers tape, or sleeves as @Demontrich said
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It’s not a common size for the sleeves plus the sleeves would cover the drain hole.
I’m just going to pick a a cold trap with a 24/40 joint at the bottom and take this one out to my range.
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Post a pic, in sure one of us can come up with a solution.
I can smell epoxy !
Edit: misread original post, I thought you said $10k to $20k 
I’m 732 feet above sea level
Hire a consultant to put you together a distillation package at a reasonable price…OR search bar it!
As most people have mentioned, do not skimp on the pump.
In my opinion, $2,000 is not enough to purchase a new 5L system, even if you cheap out on every single component…if you do cheap out on every single component, you are going to have some problems.
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What would you say a good range would be on average 3-4?
Again, paying someone 5% the total cost of the system to put it together for you is always my suggested method, but a good system:
$10,000 - @spdking 5L kit - https://summit-research.tech/product/spd-5-package-a/
$3,000 - Edwards E2M28 - Edwards E2M28 Rotary Vane Pump, 1 Phase, Rebuilt
I always encourage people to get a small recirculator, it’s just cleaner and gives more control over the system.
Realistically though, you can get a sous-vide on amazon for a few hundred bucks.
You can get a 5L turnkey system from xtractor depot for $12,000 Pathfinder Series 5L Short Path | SPP-5L
You can piece together a fullbore system from USALab for about half that.
I would recommend going with higher end stuff, because even if you’re in CA you’re talking about 3L of distillate to pay back a GOOD system.
Or 1,000 cartridges if you’re selling at $15/cart.
That’s my 
for today
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Lvl4 spoon
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I gotta pretty decent 30 L Roto available in the classifieds
Your no where near full vac then.we can pull well below that at 600 feet. Full vac should be somewhere around -29.2 to -29.6 at your altitude on your gauge. After that your into the micron ratings.
We peg out the -30 vacuum gauge on the reactors with a 12cfm 2 stage rotary vein pump.
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Could that be due to using the cheap plastic hosing that came with the across international .9 vac oven and vaccum or is that more because of just needing a better pump?
I usually get right at 700 on the gauge
I’m new to this whole thing too so I’m not looking to pump out much more than a few liters a month for now.