Search  for anything...

TWINSTAR CO2 Diffuser | Freshwater Aquariums up to 120 gallons | Ultra Clear Acrylic - Made in South Korea | Extremely Fine Pearls | More Porous Membrane (M-19mm)

  • Based on 0 reviews
Condition: New
Checking for the best price...
$12.99 Why this price?
Save $18.00 was $30.99

Buy Now, Pay Later


As low as $3 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Tuesday, May 19
Order within 5 hours and 15 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Size: M-19mm


Description

The CO2 diffusor from Twinstar is made out of acryl and is, therefore, not prone to breakage. The diffusors function extremely efficiently because their special membrane technology allows a very fine CO2 atomisation. The membrane is not located inside the diffuser, as is usually the case, but on top of its body. The advantage is that the CO2 bubbles are able to stream out of all the membrane's pores, on top as well as on its sides. Hereby, the diffusor provides the best possible carbon fertilisation in a planted aquarium. Why Choose TWINSTAR diffusers: Finest CO2 bubbles produced in the market. Budge- friendly Better Design. Works with all CO2 system, even DIY steps Twinstar Diffuser includes: 1x Diffuser 1x Suction cup Before use: Immerse the diffusor in water for 10 minutes so that all the air in the diffusor is displaced. If there is still air in the diffusor, larger bubbles may form at the bottom of the diffusor ceramic.s. Tip: When bubble diffusion is slowed, remove the suction cup from the diffuser to avoid it from getting damaged, soak the diffuser in bleach for 10-30 minutes and rinse with water thoroughly to ensure any residual bleach is gone.

Package Dimensions ‏ : ‎ 3.54 x 1.77 x 1.18 inches; 0.35 ounces


Date First Available ‏ : ‎ January 30, 2023


Manufacturer ‏ : ‎ Twinstar


Best Sellers Rank: #23,985 in Pet Supplies (See Top 100 in Pet Supplies) #215 in Aquarium Water Treatments


#215 in Aquarium Water Treatments:


Customer Reviews: 4.1 4.1 out of 5 stars (736)


Item Weight: 0.352 ounces


Manufacturer: Twinstar


Date First Available: January 30, 2023


Item Package Dimensions L x W x H: 3.54 x 1.77 x 1.18 inches


Brand Name: TWINSTAR


Target Audience Keyword: fish


Size: M-19mm


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, May 19

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • works great
Size: M-19mm
excellent product. produce lots of fine bubbles. if kept hidden from light it will not get fill with algae so less maintenance.
Reviewed in the United States on August 10, 2025 by tom0220

  • They work fine.
Size: S-15mm
They work fine for a nano. They are small - be sure to order the correct size.
Reviewed in the United States on July 28, 2025 by D. Porter

  • Small and flimsy!
Size: L-24mm
I got the large size and when it arrived it was really small- it was intended to use with my 55 gallon fish tank. I can’t speak on how well it actually works because I never got the opportunity to try it. The diffuser snapped as I was trying to attach it to my hose. It’s super cheaply made. Had to return. ... show more
Reviewed in the United States on September 27, 2025 by Angela

  • CO2 Diffuses
Size: L-24mm
I like the CO2 Diffuser a buy 2 of them
Reviewed in the United States on January 17, 2026 by carmelita foster

  • Very nice
Size: L-24mm
Works very well with co2 in aquarium
Reviewed in the United States on July 17, 2024 by Jamus pierce

  • CO2 generator
Size: S-15mm
Works great! Makes tiny CO2 bubbles
Reviewed in the United States on March 19, 2025 by Henry Cianciabella

  • Best value
Size: S-15mm
Cheap, solid, disposable priced, high performance. Not the best for price reasons, but good luck finding a consistently made quality item at this price
Reviewed in the United States on November 20, 2023 by Stephen Amos

  • Great value.
Size: L-24mm
Great value.
Reviewed in the United States on July 11, 2025 by Sea Rabbit

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...