there's a few other clean options... look at racing catalogs.
like:
http://www.summitracing.com/parts/HTR-HG250B/
http://www.jegs.com/p/Fire-Bottle/Fire-Bottle-Fire-Systems/753270/10002/-1
like:
http://www.summitracing.com/parts/HTR-HG250B/
http://www.jegs.com/p/Fire-Bottle/Fire-Bottle-Fire-Systems/753270/10002/-1