The MAID O MIST STEAM AIR VALVE A889 #D 1/8" ANGLE is a central furnace heating system by Jacobus. This model is designed to use steam as a power source and has an efficiency rating within the A+++ - D range. Made in the United States, this valve features a 18-inch width and comes brand new in the box with free shipping included, making it a convenient and reliable choice for home heating needs.