Other What InLine PCP Regulator do people use?

The most common that I’ve seen is the Aqua Environment 415 series. It’s sold under various names/configurations:

415-5000 (NV optional)
415-6000 (NV optional)

https://paintballairfill.com/product/415-6000-pressure-reducing-regulator/

https://www.ebay.com/itm/185595341422

https://airtanksplus.com/product/regman2-external-pcp-airgun-regulator/

https://nuvair.com/pb415-347-lp.html

https://www.topgun-airguns.com/product/regulated-hose-assembly-0-400-psi-output/

You can either buy it bare and add your own gauges and connections, or order it from a dealer already setup with the options you want.

5000 or 6000 psi will work (not 400), and self vented or add an external vent.

I ended up with a Praxair industrial regulator for a good price, but it’s heavy (SS or plated brass, not aluminum). There are other good brands and sometimes good deals on eBay if you know what to look for.
 
Aqua Environment Mod 1575-6000. Buy directly from them.. There the best by far...

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That 1575 looks good too. Very similar to their 415 but allows up to 7000psi input. For our purposes, either will work fine.
So a new model up to 7000psi :) :) ..Even better...I only have 5500 psi Scott 5.5 tank so 6000 psi should be good until the industry comes up with tanks and compressors+ booster pumps over 5500 psi. It really is pretty cool all the 5500 psi lineup for SCBA.....5500 psi regulated to 4500 psi get amazing foot pounds in Texan platforms with African Air Ordinance 4500 psi valves....hopefully get there one day...