www.pmmag.com/articles/88797-spirotherm-dirt-separator
Spirotherm Dirt Separator
May 1, 2004

Spirotherm Inc. manufactures Spirotrap® Junior dirt separators for residential or light commercial hydronic systems. It creates a low-velocity area of water to allow dirt and scale to sink to the bottom of the unit. Easy-to-install, Junior offers an all-brass, maintenance-free design and 20-year warranty. Available in 3/4-inch through 1 1/2-inch FPT.
Circle 8