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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FZONE Pro Series Aquarium Dual Stage CO2 Regulator Adjustable Output Pressure with DC Solenoid and Integrated High Precision Needle Valve and Bubble Counter

Product ID: 204325150

Details

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

💡12V DC quiet solenoid

🔧Adjustable output 0-65 PSI

⚙️Dual-stage pressure stability

₩370040

Duties & taxes included

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌿 Elevate your aquatic jungle with precision CO2 control—because your plants deserve the pro touch!

PLUG PLAY SETUP - Includes CGA320 adapter and installation tools for quick, hassle-free installation on North American tanks.
TAILORED CO 2 DELIVERY - Adjust output pressure from 0 to 65 PSI to perfectly match your aquarium’s unique needs.
SAFE SILENT OPERATION - 12V DC solenoid ensures whisper-quiet, energy-efficient CO2 control with built-in safety valve.
MODULAR MULTI TANK READY - Two independent needle valves and bubble counters let you run one or two tanks seamlessly.
UNSHAKABLE PRESSURE CONTROL - Dual-stage design guarantees consistent CO2 flow—no more end-of-tank surprises.

The FZONE Pro Series Dual Stage CO2 Regulator offers professional-grade, stable CO2 delivery with adjustable pressure up to 65 PSI. Featuring a modular manifold with two high-precision needle valves and bubble counters, it supports single or dual aquarium setups. Its 12V DC solenoid runs quietly and safely, while the built-in safety valve prevents overpressure. Designed for North American CO2 tanks with included CGA320 adapter and installation tools, this regulator is ideal for serious planted tank enthusiasts seeking reliable, customizable CO2 injection.

Specifications

ASIN	B0838KXK5D
ASIN	B0838KXK5D
Best Sellers Rank	#52,480 in Pet Supplies ( See Top 100 in Pet Supplies ) #173 in Aquarium Air Pump Accessories
Brand Name	FZONE
Customer Reviews	4.3 4.3 out of 5 stars (662)
Date First Available	May 22, 2020
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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