38mm Stainless Growler Carbonation Cap

  • Item #R64
  • Price: $14.99
- +

In stock, will ship on Saturday, April 1

An all stainless male gas ball lock cap that fits 38mm plastic PET growler bottles. This allows the PET Growler to be charged with C02 from any female ball lock gas fitting (like our item D32 or D03 Gas Connector), carbonating the cold beverage in the bottle including cold water. Cap threading is industry standard 38-400 growler threading.

This is ideal for adding a bit of charge to a PET growler after you fill it, as no matter how carefully you fill a PET growler from a draft system, some C02 carbonation is lost. Great for serving draft beer away from the keg. For use with plastic bottles only.  Note: This does not fit PET bottles with standard PICO thread, like our item I12.


Always wear eye protection. For use with plastic bottles only. Never exceed 20psi carbonation pressure.

Average rating 10 out of 10 ( based on 2 reviews )

Growler Preshcap

Review by Dan Mulera on 1/24/2023

Makes a very satisfying seal on the growler. Nothing better than a healthy "shpew when you're unscrew". You'll get the nod from your brew friends.

Works perfectly on my growler and Tap A Draft

Review by Josh on 10/3/2014

Makes it easy for me to charge my growler so it does not go flat. Also fits my Tap A Draft.

Dec 05, 2022 by Andy C Rae

Q: Does this cap have any connection on the inside of the bottle in order to connect a carbonating stone?

A: No, it does not have a dip tube or any other tubing connection.

Nov 29, 2022 by Brad

Q: Will this fit the oxebar kegs from kegland? PCO38 cap size?

A: Yes, it fits.

Feb 17, 2022 by john

Q: How long will this cap keep a plastic growler pressurized if it is not opened after filling?

A: Several months, or as long as another type of growler cap would keep the plastic growler pressurized.

Oct 23, 2020 by Mike Engel

Q: Where can we buy the bottles this cap fits?

A: There are some plastic growlers for sale on ebay.com Never use these caps with a glass container. They are suitable for plastic or stainless steel ONLY. https://www.ebay.com/itm/64-oz-Amber-Growler-PET-Plastic-with-Cap-PERFECT-WHERE-GLASS-IS-NOT-ALLOWED/264161420643?hash=item3d813f6563:g:zY4AAOSwP85cSddO

Mar 13, 2019 by Tyler

Q: will this fit on a 1-gallon plastic juice bottle like this?: https://www.amazon.com/HAWAIIAN-PUNCH-JUICY-GALLON-BOTTLE/dp/B008A7946G

A: Not recommended, as the juice bottle is not designed to hold any carbonation.

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