What is the max psi on the input side

The instructions just say max. pressure 145 lbs. with no mention of input or out put. I assumed input but after reading the add I see it is out put. So I don't think I can help you. I would try to check directly with the mfg.

Is it supposed to hiss (leak air) when it is set to a pressure lower than the tank?

As you adjust the pressure downward, the regulator will let a little wisp of air out as you turn the knob. However, it should not leak air at any other time. If yours is leaking continuously, something is wrong with it.I should add that William R and I both assume the hissing is "leakage out" from the regulator, such as around the knob. The regulator will 'leak through' to maintain the set pressure downstream. If your downstream system has a leak, the regulator will allow air through to make up for the leakage. This would be normal operation.

When looking down at the top of the knob, what side is the gauge on? And, does it have an L or R stamped on it?

It should have arrows or in/out to indicate the direction of flow for your connections so base your fittings based on that. with the supplied bracket and the right fittings (1/8" npt nipple and 1/8" npt female/female elbow), you can have the gauge face out, up, down, left or right.

Would the regulator fit on a 24 oz CO2 bottle with a pin valve

That I do not know, But these type of gauges and regulators are meant to be used with compressed air usually no more than 250 psi. And to the best of my knowledge, compressed gases such as C02 is normally around 3000 psi. To get a definite answer, I would consult with the manufacturer of the product.

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R1401G Mini Air Regulator with steel-Protected Gauge, 60-Scfm At 100-Psi, 1/4" Npt

Product ID: 3452166

Details

Brand
Primefit
Item Weight
6.4 ounces
Item dimensions L x W x H
3.5 x 1.5 x
Material
Aluminum
Number of Items
1

🔒Locking regulator knob for stability

⚙️Precise pressure control 1-145 PSI

🛡️Steel-protected durable gauge

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Description

🔧 Lock in your airflow, unlock your productivity!

TRUSTED LEGACY - From Primefit, a leader since 1976, delivering industry-grade pneumatic precision with a 1-year limited warranty.
BUILT TO ENDURE - Steel-protected gauge resists damage on busy job sites and portable compressors—durability you can trust.
COMPACT POWERHOUSE - Miniature 3.5x1.5x3.5 inch design fits seamlessly into any air system without bulk.
EFFORTLESS INSTALLATION - Includes mounting brackets for quick setup, so you’re back to work faster and smarter.
PRECISION PRESSURE MASTERY - Locking knob ensures exact air pressure from 1 to 145 PSI, eliminating guesswork and boosting tool performance.

The Primefit R1401G Mini Air Regulator offers precise air pressure regulation from 1 to 145 PSI with a locking knob for consistent performance. Its steel-protected gauge ensures durability in demanding environments, while the compact aluminum body and included mounting brackets make installation seamless. Backed by Primefit’s legacy since 1976 and a 1-year limited warranty, this mini regulator is engineered for professionals who demand reliability and control.

Specifications

ASIN	B00IDCYKEY
Best Sellers Rank	#82,794 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #10 in Compressed Air Combination Filter Regulator Lubricators
Brand Name	Primefit
Customer Reviews	4.4 4.4 out of 5 stars (838)
Global Trade Identification Number	00816227016164
Included Components	Air Regulator
Item Dimensions	3.5 x 1.5 x 3.5 inches
Item Type Name	Mini Air Regulator
Item Weight	6.4 ounces
Manufacturer	Primefit
Material Type	Aluminum
Model	R1401G
Number of Items	1
Number of Packs	1
Part Number	R1401G
Thread Style	Npt
UPC	816227016164 787721681359
Unit Count	1 Count
Warranty Description	1 Year Limited

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117.29 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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