Description
Features:
- 7075 Aluminum
- Black Anodize
- Female 7/8-14 threads
- Male M18x1.5 threads
$30.00
This adapter allows you to convert the threads on our tank valve from 7/8-14 to M18x1.5. The M18x1.5 is common on carbon fiber gun tanks.
Sold out!
Features:
| Weight | 6 oz |
|---|---|
| Dimensions | 2 × 3 × 2 in |
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Regulator Service or Pressure Change
This is a service to repair, test, leak test, adjust or increase the output pressure of a Umarex Gauntlet 1 or 2, regulator to a customer’s requested output. The regulator will be tested and calibrated to within +/- 75 PSI. Parts such as Gauges, Burst discs, Bonnets, Pistons, Caps, or Regulator bodies are not included. If parts are determined to be required to repair the regulator, pricing will be determined, quoted, and will need to be paid prior to the return of the regulator.
Please note that if you have a Taiwan-produced regulator, which is the regulator that is located at the top of the photo, there are very limited corrections that can be made to these units, and you may end up needing a new regulator. Please use the notes area to provide the Generation and caliber of the rifle. Also, give as much detail as possible of the issue or the requested pressure output, and so forth.
I wrote an article on the regulator change back in 2019, read all about HERE
Once the order is physically reviewed, you will receive a second notification with details associated with packaging and shipping the items in for service.
When you place the order for the above-described service, you will receive an order processing notification. Shortly after that, you will receive a detailed notification with the shipping information for you to ship us your regulator or regulator and tank assembly.
This service is not a hydro test of the tank/bottle and is focused only on the regulator’s functionality and visual inspection assemblies.
Please note that this service is not associated with any manufacturer’s warranty, so please be sure to exhaust all warranty options prior to sending us your regulator for service as our working on the part voids any manufacturer-provided warranties.
4.5K PSI Ninja Reg on a 18ci/295cc/.29L CE Certified CF Tank

Direct replacement with no modifications required for the Umarex Gauntlet 2 & G30/G30SL!
18ci/295cc/.29L 4500 PSI Carbon Fiber Bottle
Hajimoto is bringing sexy back! Doesn’t that carbon fiber look awesome on there!
Includes Ninja’s HP regulator.
The CF Tank is CE Certified made to ISO 11119-3 standard. They have seamless aluminum alloy 6061 liner wound with high strength Japan-imported carbon fiber and glass fiber reinforced plastic full composite layers and subjected to an autofrettage pressure. This 4500 PSI carbon fiber bottle is 18ci and is absolutely gorgeous on the Gauntlet 1 or Gauntlet 2.
The Gauntlet 1 will need to increase its tank shroud inside diameter to allow the foregrip/tank cover to side over this carbon fiber tank.
Operating Pressure Recommendations
Gauntlet 1:
.177/.22 Stock operating pressure 1100PSI Max Recommended pressure is 1400PSI.
.25 Caliber Stock operating pressure 1900PSI Max Recommended pressure is 2100PSI.
Gauntlet 2:
.22 Stock operating pressure 1900PSI Max Recommended pressure is 2100PSI.
.25 Caliber Stock operating pressure 2100PSI Max Recommended pressure is 2300PSI.
Gauntlet 30/30SL:
Stock operating pressure 2800PSI Max Recommended pressure is 3100PSI.
NINJA REGULATORS ARE MADE IN THE USA!
Flex reg and 22.5ci/370cc/.37L CE Certified CF Tank
Introducing a Hajimoto Productions Exclusive offer!
22.5ci/370cc/.37L CE Certified CF Tank (Available in matte or glossy finish)
Newly redesigned unit
Now has a high pressure and low pressure burst discs!

Installs on the Gauntlet 2 with minor tank shroud modifications, forearm slides right over the carbon fiber cylinder. Installation video at the bottom of the page.



The CF Tank is CE Certified and made to ISO 11119-3 standard. They have seamless aluminum alloy 6061 liner wound with high strength Japan-imported carbon fiber and glass fiber reinforced plastic full composite layers and subjected to an autofrettage pressure. This included a 22.5ci carbon fiber 4500PSI cylinder with externally adjustable Ninja Flex Reg for your custom build including the Umarex Gauntlet 1 or Gauntlet 2! The massive volume of air in these 22.5ci tanks is mind-blowing!
The diameter of the tank is 54-55mm across so a modification to the forearm is required on a Gauntlet 1. I do offer a tank shroud modification service for Gauntlet 1 owners that can be added to a build or provided as a mail-in service.
Please be careful if you have accessories on any of the M-Lok openings as the screws or MLok fasteners may protrude into the tank area and scratch the tank when the shroud is slid forward or back. We recommend that if you have any MLok accessories installed, you remove them when sliding the shroud on or off. We also recommend covering the brass inserts in the tank shroud with cloth tape to protect your carbon fiber finish.
The Gauntlet 2 forearm slides right over without any issue. Only one access hole needs to be drilled so the fill port is accessible at the bottom. See photo below

Consider picking up our extended foster fill adapter to make coupling and filling a breeze.
The Power Flex Combo allows the user to externally adjust the regulator output pressure on the fly with an adjustment range of 800PSI!
When installing the Flex regulator on the Umarex Gauntlet. Tighten the degassed tank and regulator assembly fully to the rifle, then back it off until the fill port is on the bottom and the gauges are left and right. Now fill the bottle with air and all will tighten up solid. Proper alignment will be achieved before the 360° maximum rotation limit is realized.
Comes with a dedicated Spanner Wrench for power adjustment. MADE IN THE USA!
Because of practical limitations, regulator output will be +/- 75PSI to the requested output.
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