---
product_id: 4255426
title: "38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]"
price: "5.16 OMR"
currency: OMR
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.om/products/4255426-38mm-poly-seal-screw-caps-fits-most-1-2-1
store_origin: OM
region: Oman
---

# Seal keeps carbonation 38mm universal fit Reusable & durable 38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]

**Price:** 5.16 OMR
**Availability:** ✅ In Stock

## Summary

> 🍾 Keep your fizz fresh and your brew boss-level tight!

## Quick Answers

- **What is this?** 38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]
- **How much does it cost?** 5.16 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/4255426-38mm-poly-seal-screw-caps-fits-most-1-2-1)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Universal 38mm Fit:** Fits most 1/2 & 1 gallon jugs including GT's Kombucha bottles
- • **Bulk Pack Convenience:** 12 caps per bag to keep your brewing game fully stocked
- • **Reusable & Eco-Friendly:** Durable poly material designed for multiple uses
- • **Perfect for Home Brewers:** Trusted by kombucha enthusiasts to maintain optimal carbonation
- • **Reliable Carbonation Seal:** Locks in fizz for perfect 2nd ferment every time

## Overview

These 38mm poly seal screw caps are engineered to fit most 1/2 and 1 gallon jugs, including both old and new-style GT's Kombucha bottles. Crafted from durable, reusable poly material, they provide a tight seal that locks in carbonation, making them ideal for home brewers aiming for perfectly fizzy second fermentations. Sold in convenient packs of 12, these caps combine functionality with eco-conscious reuse, ensuring your kombucha stays fresh and your brewing setup stays ready.

## Description

38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]

Review: These DO fit new-style GT's Kombucha & GT's Synergy bottles (and old style bottles too) and keep in the fizz! - I home brew kombucha and needed caps that sealed tightly to keep in carbonation during the 2nd ferment. In reading over the Q & A's for this product, one gentleman posted that these caps do not fit the new-style Dave's GT kombucha bottles. The new bottles have a slightly different screw-thread configuration versus the previous style bottles. You can tell if you have the new-style bottles as now the "GT" is a raised design on each plastic bottle cap. (The older bottles had a smooth plastic top - no embossing.) I respectfully disagree with his answer as I am very pleased with the fact these caps do work very well on the newer style GT bottles, and I've not had a problem with them doing the job I want them to do - and that is fitting so well that no carbonation leaks out. ~~ OLDER style GT bottles: These caps fit perfectly. I've made a number of batches and the carbonation is totally contained - nothing can leak through the sides of these caps. I am now getting super fizzy (YUM!) kombucha. ~~ NEW style GT bottles: Because the screw-threads are a little closer together and configured a bit differently than the previous style bottles, these poly-seal caps don't screw/tighten down as far as the caps that come with the bottles. HOWEVER, as long as you MAKE SURE to twist them on tight, making sure they are screwed down as far as they can go, they work great! I've had absolutely no loss of carbonation when using these on the new style bottles. The fizz factor is just the same as using these caps on the old style bottles. So, I am very pleased and happy I tried them, as I have more of the new style bottles on hand than the old style. **Remember: no matter what GT bottle you're using ... make sure to really tighten the caps after filling. You should then have great success with your 2nd ferment (if all other steps in the 2nd fermenting process are done properly). UPDATE: 4/27/2017: After 9-months of using the same caps on the newer bottles I think I've had a good amount of experience with them. I still say these caps work well on the newer thread-style GT bottles almost all the time. Now you will find that the caps seem to not screw all the way down - this is due to the thread design. And after the 2nd fermentation is done, I will admit that sometimes a bottle isn't as fizzy as another. But I still have a few of the original thread-design bottles and sometimes one of those isn't as fizzy as the others (I put them in the frig after the 2nd brew as I make a number of bottles at a time). One kombucha brew can sometimes be more or less carbonated than the next as many "kombucha brewing experts" mention. But no matter what, I have always had some level of carbonation in all bottles with the newer thread-style after the 2nd brew. **What I have found is what other's have posted on other sites ... it can help to turn the cap gently to the left to get it seated on the thread, and then screw it on tight. But in a perfect world, I do wish a cap manufacturer would make caps that really fit the newer GT bottles. But the "GT" initials are embossed right into the glass on the bottom, so maybe Dave (Dave's GT) does have an exclusive on the thread design, and cap manufacturers aren't interested in catering to a very small percentage of those who are kombucha home brewers.
Review: Perfect caps for 1 gallon - These fit great on 1 gallon glass jug. Would buy again.

## Features

- 38mm Poly Screw Cap
- 12 Count
- Reusable

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Best Sellers Rank | #29,800 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Lab Cap Plugs |
| Customer Reviews | 4.6 out of 5 stars 1,921 Reviews |

## Images

![38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12] - Image 1](https://m.media-amazon.com/images/I/61YW29ej8pL.jpg)

## Questions & Answers

**Q: Will these caps fit GT's Kombucha bottles?**
A: I just received 24 these. They are the black plastic caps with the cone shaped seal. They fit our GT kombucha bottles perfectly.10-08-2015 UpdatedHeads Up!GT's Kombucha has recently changed their bottles.The new style bottle has:	"GT's" embossed on the outside top of the white plastic cap.	The inside plastic cap threads are not continuous.	The inside top of the plastic cap is light blue.	The glass bottle has 2 complete threads around the mouth.The older style bottle has:	Plain white plastic cap top	Cap has continuous inside threads	One complete thread around the mouth of the bottle.	These 38mm poly seal black replacement caps will NOT work on the new style bottles.

**Q: These did not fit my 1 gallon jug do you sell another size?**
A: These do not fit New Wave Enviro jugs. Despite the comments here, I tried. As instructed by others here, I push down on thr cap when screwing it and it appears fine, but shortly after, the cap split and broke.

**Q: Do these seal for storage?  I want them for maple syrup storage instead of canning.**
A: Yes, they would seal for 'storage'

**Q: Is this a 38/400 sized cap?**
A: Thanks for asking. Yes, this is a 38/400 thread cap.

## Customer Reviews

### ⭐⭐⭐⭐⭐ These DO fit new-style GT's Kombucha & GT's Synergy bottles (and old style bottles too) and keep in the fizz!
*by B***F on March 21, 2016*

I home brew kombucha and needed caps that sealed tightly to keep in carbonation during the 2nd ferment. In reading over the Q & A's for this product, one gentleman posted that these caps do not fit the new-style Dave's GT kombucha bottles. The new bottles have a slightly different screw-thread configuration versus the previous style bottles. You can tell if you have the new-style bottles as now the "GT" is a raised design on each plastic bottle cap. (The older bottles had a smooth plastic top - no embossing.) I respectfully disagree with his answer as I am very pleased with the fact these caps do work very well on the newer style GT bottles, and I've not had a problem with them doing the job I want them to do - and that is fitting so well that no carbonation leaks out. ~~ OLDER style GT bottles: These caps fit perfectly. I've made a number of batches and the carbonation is totally contained - nothing can leak through the sides of these caps. I am now getting super fizzy (YUM!) kombucha. ~~ NEW style GT bottles: Because the screw-threads are a little closer together and configured a bit differently than the previous style bottles, these poly-seal caps don't screw/tighten down as far as the caps that come with the bottles. HOWEVER, as long as you MAKE SURE to twist them on tight, making sure they are screwed down as far as they can go, they work great! I've had absolutely no loss of carbonation when using these on the new style bottles. The fizz factor is just the same as using these caps on the old style bottles. So, I am very pleased and happy I tried them, as I have more of the new style bottles on hand than the old style. **Remember: no matter what GT bottle you're using ... make sure to really tighten the caps after filling. You should then have great success with your 2nd ferment (if all other steps in the 2nd fermenting process are done properly). UPDATE: 4/27/2017: After 9-months of using the same caps on the newer bottles I think I've had a good amount of experience with them. I still say these caps work well on the newer thread-style GT bottles almost all the time. Now you will find that the caps seem to not screw all the way down - this is due to the thread design. And after the 2nd fermentation is done, I will admit that sometimes a bottle isn't as fizzy as another. But I still have a few of the original thread-design bottles and sometimes one of those isn't as fizzy as the others (I put them in the frig after the 2nd brew as I make a number of bottles at a time). One kombucha brew can sometimes be more or less carbonated than the next as many "kombucha brewing experts" mention. But no matter what, I have always had some level of carbonation in all bottles with the newer thread-style after the 2nd brew. **What I have found is what other's have posted on other sites ... it can help to turn the cap gently to the left to get it seated on the thread, and then screw it on tight. But in a perfect world, I do wish a cap manufacturer would make caps that really fit the newer GT bottles. But the "GT" initials are embossed right into the glass on the bottom, so maybe Dave (Dave's GT) does have an exclusive on the thread design, and cap manufacturers aren't interested in catering to a very small percentage of those who are kombucha home brewers.

### ⭐⭐⭐⭐⭐ Perfect caps for 1 gallon
*by C***2 on December 8, 2025*

These fit great on 1 gallon glass jug. Would buy again.

### ⭐⭐⭐⭐⭐ Plastic caps
*by J***S on December 17, 2025*

Love these. Work very well for my glass jugs. Replaces metal, that gets rusty

## Frequently Bought Together

- 38mm Poly Seal Screw Caps (fits most 1/2 & 1 gallon jugs) [Bag of 12]
- Glass Jug, 1 gal (Pack of 8),clear
- Home Brew Stuff 75012WT White Metal Growler Caps 38mm Fits Most 1/2 and 1 Gallon Jugs (12)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-13*