BlueFlame,

Check out www.omegaps.com and their ERICO / CRITEC line of surge suppression equipment, as well as their lightning equipment. Their TVSS units utilize the gas tube technology. Cruise through the *.PDF files for more detailed info.

Comanche7

disclaimer
I'm not an owner, business partner or even have a vested interest in this company. I've known the owner, and have purchased their equipment for almost ten years now, and never had cause to regret buying from them.