I have a competitor who got a great deal on links 10 or 12 years ago. Of course, this is the same guy who mixes nozzles between different brands, who uses kidde gas valves on Ansul systems, still thinks all wet systems are UL 30 compliant. He recharges Fire Extinguishers w/o taking them off the wall, all of his tamper seals are blue, the recharge labels are on the front of the the cylinder. The guy is good! And w/o saying, he is cheaper.
Then there is the competitor who never tips the fan, and cleans the duct from the floor up into the duct.
General Fire Equipment Co of Eastern Oregon, Inc