Vertical mount air separators and optional isolation accessories from Webstone, a brand of NIBCO, can be conveniently placed beneath a wall-hung boiler, upright in the system supply line. They are available in 3/4- or 1-inch sizes, with MIP, FIP, sweat or press connections. Isolation accessories include full port ball valves and Isolator Uni-flanged ball valves. The G1 union connections simplify installation and prepare the air separator for future service. A G1 dual temperature gauge can help verify boiler output right at the source. 800-225-9529; www.webstonevalves.com.