Here is a link to an adapter I bought and used with hydrogen at GPSL 2018.  The listing shows a car radio in the photo for some bizarre reason but it is the same listing I ordered from in 2018.

https://www.amazon.com/dp/B0029YB1FS/ref=cm_sw_r_cp_awdb_imm_1GK29DZSWXBJBZ5ZNATX?_encoding=UTF8&psc=1

On Jul 7, 2021, at 12:44 PM, Dennis Klipa - N8ERF <klipadk@...> wrote:



Hank,

I could not find that adapter on Amazon (poor search skills).  Could you provide a link to that adapter?

Ironically, Airgas won't sell me hydrogen.  But another, less convenient supplier will.

Best Regards,

Dennis

On Wed, Jul 7, 2021, 3:27 PM Michael Hojnowski <kd2eat@...> wrote:

Yes, I use an adapter like that for my regulator.  Perhaps not an ideal adapter if you're welding, or attached to the tank for long periods of time, but for a balloon fill, I think it's completely reasonable.

Mike / KD2EAT

On 7/7/2021 2:48 PM, Hank Riley via groups.io wrote:

A new regulator is not necessary because there are standard, CGA approved adapters available for doing these conversions.  The type needed is an CGA 350 (Hydrogen side) to CGA 580 (Helium side).

https://www.airgas.com/product/Gas-Equipment/Gas-Equipment-Accessories/Adapters-%26-Fittings/p/WES808



Amazon has them for less than Airgas.  I just used Airgas to show that these adaptors are legitimate.

This subject of switching to hydrogen comes up every once in a while here.  See for instance, from last year,  message  #17581 and those following.

Hank
______________________________________________________________________________

We have switched to hydrogen. Unfortunately the connections have a reverse thread from the helium tanks,
so you need a new regulator. But the cost difference in the gas pays for the regulator in a couple of launches.

Kip