Reddit mentions: The best cap plugs for labs
We found 11 Reddit comments discussing the best cap plugs for labs. We ran sentiment analysis on each of these comments to determine how redditors feel about different products. We found 3 products and ranked them based on the amount of positive reactions they received. Here are the top 20.
1. 38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]
- 12 count
- Fits most 1/2 gallon and 1 gallon jugs
- The poly cap will NOT rust over time
Features:
![38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]](https://m.media-amazon.com/images/I/51MVML7elqL._SL300_.jpg)
Specs:
| Color | Black |
| Height | 1.2 Inches |
| Length | 9 Inches |
| Number of items | 12 |
| Size | 38mm Poly Seal Screw Caps |
| Width | 3.2 Inches |
2. E.C. Kraus 28Mm Metal Screw Caps (12)
- 28 mm metal Screw caps
- Item Package Length: 3.599999996328"
- Item Package Width: 3.299999996634"
- Item Package Height: 1.099999998878"
Features:
Specs:
| Color | White |
| Height | 1 Inches |
| Length | 9.25 Inches |
| Number of items | 12 |
| Width | 5.5 Inches |
3. National Scientific C5000-54R Target DP Robo Cap, PTFE/Silicone Septum, Polypropylene, Green (Pack of 1000)
- Pate/silicone septum
- Polypropylene
- Red
- Pack of 1000
Features:
Specs:
| Color | Green |
| Number of items | 1000 |
| Release date | June 2017 |
| Weight | 0.001984160358 Pounds |
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Summary
1. 38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]
- 12 count
- Fits most 1/2 gallon and 1 gallon jugs
- The poly cap will NOT rust over time
Features:
Specs:
| Color | Black |
| Height | 1.2 Inches |
| Length | 9 Inches |
| Number of items | 12 |
| Size | 38mm Poly Seal Screw Caps |
| Width | 3.2 Inches |
2. E.C. Kraus 28Mm Metal Screw Caps (12)
- 28 mm metal Screw caps
- Item Package Length: 3.599999996328"
- Item Package Width: 3.299999996634"
- Item Package Height: 1.099999998878"
Features:
Specs:
| Color | White |
| Height | 1 Inches |
| Length | 9.25 Inches |
| Number of items | 12 |
| Width | 5.5 Inches |
3. National Scientific C5000-54R Target DP Robo Cap, PTFE/Silicone Septum, Polypropylene, Green (Pack of 1000)
- Pate/silicone septum
- Polypropylene
- Red
- Pack of 1000
Features:
Specs:
| Color | Green |
| Number of items | 1000 |
| Release date | June 2017 |
| Weight | 0.001984160358 Pounds |
I am as well, Old Gt Bottles with a cap like this(cheaper at your local homebrew store) Have been working. however I use(and recommend because one growler takes up less space then 3 or so gt bottles) a Big growler with this cap for 2F and then strain into gt bottles that go straight to the fridge.
I switched out the regular growler tops for these
38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12] https://www.amazon.com/dp/B0064OFP88/ref=cm_sw_r_cp_apa_dnBDyb93PHGC3
Work awesome and fit any 64 oz growler I've tried them on.
You can get replacement tops for the GT bottles. They are not too expensive at Amazon.
Mason jars are made to withstand vacuum, not internal pressure. so you're more likely to have an explosion with those than a bottle made to have internal pressure. The Grolsh style beer bottles work great. I also like using 1/2 gallon growlers (get the ploy caps).
I don't know for sure, but I'd try this or a plastic version like this.
Like these?
https://www.amazon.com/38mm-Poly-Seal-Screw-gallon/dp/B0064OFP88/ref=asc_df_B0064OFP88/
https://smile.amazon.com/gp/product/B0064OFP88/
These fit on all the carboy's that I've bought.
These are the ones I originally found but i live in Canada and didnt want to deal with cross border shipping on a little mom an pop shop, so I found basically the same thing on amazon
https://www.amazon.com/National-Scientific-C5000-54R-Silicone-Polypropylene/dp/B01MSDYEF0
​
EDIT: 'screw cap' for vials.
Yeast dies at what? 140° - 145°F? I can make a sous vide water bath with a circulator at about 150°F+ to pasteurize in for about an hour. The type of caps I have for my 1 Gallon Carboys are 38mm Poly Seal Screw Caps. No idea if they would be strong enough for the pressure though.