The needle valve isn't very good. The bubble count drifts often. Is there a way to manage this? Or change out for a better needle valve?

I don’t have that problem with either of mine. The needle valve is a secondary regulation device. Try adjusting the primary regulator valve down. This will reduce pressure to the needle valve.

I just set up the regulator. But i see that even with the power off, bubbles are coming out of the bubble counter. Is this normal?

No. That is not normal. The solenoid should shut off the flow completely. However, make sure you do not have the regulator pressure set too high. The regulator should be set to the lowest pressure that will allow bubbles to flow. Mine runs a little over 20 psi. If the pressure is set to high, the solenoid might leak.

what size wrench do i need to tighten this regulator onto the bottle of co2?

I just use an adjustable monkey wrench on mine. You don’t have to tighten it incredibly tight.

would I need a stand-alone check valve when using this regulator with an inline diffuser?

The manufacturer says the bubble counter has an integrated check valve. So no. But I would!

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FZ-2020PRO

Product ID: 204325150

Details

Brand
FZONE
Item Form
Gas
Manufacturer
FZONE
Pet Type
Fish
Unit Count
1 Count

💡Integrated high-precision needle valve

🔧Adjustable output 0-65 PSI

⚙️Dual-stage pressure stability

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HK$1782

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Description

🐠 Elevate your aquarium game with precision CO2 control—because your fish deserve the best!

DUAL AQUARIUM READY - Two independent manifold blocks let you manage one or two tanks with precision.
TAILORED CO 2 OUTPUT - Adjust pressure from 0 to 65 PSI to perfectly match your aquarium’s unique needs.
QUIET ENERGY SMART - 12V DC solenoid runs whisper-quiet and low-power for seamless automation.
BUILT IN SAFETY FIRST - Automatic pressure release valve activates above 100 PSI for worry-free operation.
UNSHAKABLE PRESSURE CONTROL - Dual-stage design guarantees steady CO2 flow—no more surprise tank dumps.

The FZONE Pro Series Aquarium Dual Stage CO2 Regulator offers stable, adjustable CO2 output with dual independent manifolds, a high-precision needle valve, and a quiet 12V DC solenoid. Designed for North American CO2 cylinders, it ensures safe, customizable, and energy-efficient CO2 delivery for one or two aquariums.

Specifications

ASIN	B0838KXK5D
ASIN	B0838KXK5D
Best Sellers Rank	#44,238 in Pet Supplies ( See Top 100 in Pet Supplies ) #151 in Aquarium Air Pump Accessories
Brand Name	FZONE
Customer Reviews	4.2 4.2 out of 5 stars (645)
Date First Available	May 22, 2020
Is Discontinued By Manufacturer	No
Item Form	Gas
Item model number	2020pro
Manufacturer	FZONE
Manufacturer	FZONE
Model Number	2020pro
Pet Type	Fish
Product Dimensions	7.56 x 2.56 x 6.69 inches; 2.4 Pounds
Target Species	Fish
UPC	764595878757
Unit Count	1 Count

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HK$1782

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In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

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