Model Vari-FT provides its own air supply from the ambient atmosphere making it ideal for installation, repair and field work on hard and soft PVC and similar thermoplastics including plexiglass, polycarbonate, polyisobutylene, polystyrene, polymide, etc. Temperature can be steplessly regulated with an electronic controller up to 1100° F. Hand welding tip VFT-20 supplied. Self-contained air supply from built-in blower/motor. On/Off Switch. Stepless temperature control knob.