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Uniweld RHP400 Nitrogen Regulator with 0-400 PSI Delivery Pressure, CGA580 Inlet Connection and 1/4-Inch Male Flare Outlet Connection

by Uniweld
4.6 out of 5 stars 130 customer reviews
| 12 answered questions
#1 Best Sellerin Welding Gas Regulators
List Price: $85.04
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  • Nitrogen Regulator, Delivery Pressure 0-400 PSI
  • CGA580 Inlet Connection, 1/4 Inch Male Flare Outlet Connection and Easy to Read 2 Inch Gauges with Protective Rubber Gauge Boots
  • Durable brass piston designed diaphragm, self re-seating relief valve (not designed to protect downstream system)
  • Large brass Tee Handle with stainless steel pressure adjusting screw and regulator bushing that prevents galling
  • Regulator can be used with CO2 with the Uniweld part no F36 adaptor, CO2 Cylinder (CGA320) to Nitrogen Regulator (CGA580) (purchased separately)
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Frequently Bought Together

  • Uniweld RHP400 Nitrogen Regulator with 0-400 PSI Delivery Pressure, CGA580 Inlet Connection and 1/4-Inch Male Flare Outlet Connection
  • +
  • Uniweld H5SMBY Soft Magic Barrier Charging and Vacuum Hose for HVACR System Service with 45-Degree Angle Fittings, 60-Inch
  • +
  • Uniweld UNF3 Nitrogen Flow Indicator with 1/4-Inch Female Flare Inlet Connection and 1/4-Inch Male Flare Outlet Connection
Total price: $123.72
Buy the selected items together

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Product Information

Technical Details

Part Number RHP400
Item Weight 2.6 pounds
Product Dimensions 5.5 x 4 x 5.2 inches
Item model number RHP400
Color Multicolored
Installation Method gas-welding
Item Package Quantity 1
Batteries Required? No

Additional Information

ASIN B008HQ6GXO
Customer Reviews
4.6 out of 5 stars 130 customer reviews

4.6 out of 5 stars
Best Sellers Rank #2,944 in Home Improvements (See top 100)
#1 in Automotive > Tools & Equipment > Welding Equipment > Welding Equipment & Accessories > Gas Welding Equipment > Gas Regulators
Shipping Weight 2.6 pounds (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available July 5, 2012

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

1.0 out of 5 starsReturned Product.
By J.L. on June 2, 2013
Verified Purchase
When I received the regulator, I was disappointed to find :1.)blister pack clear plastic had blemishes,creases and showed signs that it had been opened-up repeatedly before,2.)protruded snap-on stubs were rounded off and could not lock properly,3.)CGA-580 hexagonal nut surface was dented and 4.)T-handle's screw threads smeared with black grease(it was assembled before).I'm an overseas customer and I took a calculated risk to purchase this product as it's unavailable here and am reluctant to return the product as I have to bear cost.This product was sold by HVAC Parts Warehouse and they do not represent a Responsible and Respectable Establishment (by passing off a returned product)in my opinion.
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4.0 out of 5 starsSeems to work OK.
By Houckster on January 1, 2014
Verified Purchase
I was hesitant to write a review on this product because I have virtually no experience with this but then I thought that the experience of a newbie might be worthwhile.

Last year, I converted to nitrogen for both my truck and bicycle tires. I bought all the stuff I thought I'd need but the pressure regulator soon proved itself to be a PITA. The dial was small and when fully tightened, the gauge faced down making it difficult to read. The Uniweld RHP400 was my solution.

When attaching the regulator to the tank, you can position the gauges to the needed angle before the final tightening. Also, for those who are new to this stuff, the two gauges are very nice. The right gauge tells how much pressure is in the tank and the left gauge tells you the output pressure. Finally, there is a fitting on the bottom of the unit in the picture. If you're using a 1/4" hose, it must be removed. Believe me, it's on there tight but it's easily removed if you mount the regulator on the tank first and then use a good tight-fitting wrench to remove it. Be careful because the fitting is brass and the flats can be easily rounded off.

It took a few minutes of fiddling with the value to get the output pressure right but after that it's been fine.

I would also like to point out that when trying to learn about this product, I called Uniweld and they were very helpful.
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5.0 out of 5 starsvery nice regulator.
By tool on May 24, 2013
Regulator worked perfect for charging my coilover shocks. Good quality. Great price. Shipping was very fast. Would defiantly recommend this regulator if your pitching together a charge tank for shocks.
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4.0 out of 5 starsGood value for intermittent use
By Steven T. Snyder on December 1, 2013
Verified Purchase
I don't think this is really made of brass. It seems to be a plating thats scratches off, revealing silver metal underneath.

No matter -- this regulator is just designed for intermittent use; "testing" purposes as the packaging describes it.

I'm using this for my Bilstein nitrogen charging setup. Works perfectly for what I need. I probably will use it for 10 minutes in a whole year.

Looking for something for production use? Spend at least twice as much...
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3.0 out of 5 starsAfter buying this, I will buy a Smith next time
By Daddy Fix on November 7, 2015
Verified Purchase
Uniweld claims these are made in USA, but I am wondering if that really means they are assembled in USA from Chinese made parts. This is a case of you get what you pay for. Adjustment is touchy if you are trying to get a low flow for nitrogen purging during brazing of HVAC copper lines. It can be used for that, but if I did it every day, I would not put up with this regulator. My recommendation is spend an extra $30 and get a Smith.
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5.0 out of 5 starsExactly what I needed
By Siren on December 29, 2013
Verified Purchase
We just started offering N2 at my motorcycle shop. This regulator is exactly what I was looking for. The local gas dealer was selling it for $90.00. Ordered it on a Tues and got it that Friday. I'm not an expert on gauges but it has a good quality feel to it and after 2 months it hasn't leaked a pound. The gauges are easy to read, I am very pleased with this product.
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5.0 out of 5 starsThis is a great unit. We use it for nitrogen flush packaging ...
By Special_kaye on March 5, 2016
Verified Purchase
This is a great unit. We use it for nitrogen flush packaging of organic hops. We can take the 1800 PSI supply tank and easily regulate it down to the 8-10 PSI range for a gentle nitrogen flush that will not blow the papery dried hops out of the packaging. Will definitely buy another when needed.
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5.0 out of 5 starsIt did what I wanted but goes over 400 PSI
By Boomer on August 22, 2015
Verified Purchase
I used it to find a leak and recharge my AC system by putting in 450 psi of nitrogen so I could find a leak. It turns a slow leak into a faster leak for bubble detection. I don't know why it has a 0-600 psi gauge if it wont deliver 600 lbs. My system was marked for 450PSI max and someone could bust something if they were not careful.
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