Bullard Hot/Cold Tubes cool or warm incoming air from compressed breathing sources. When used in cool mode, the Hot/Cold Tube decreases the incoming air temperature by as much as 30° F (17° C). When warming incoming air, with a Bullard Hot/Cold Tube, the air temperature can be increased by up to 30° F (17° C). The Bullard Hot/Cold Tube is Model HC2400. Accessories include leather heat shield and assorted belts.