THIS IS A DROP SHIPPED OR SPECIAL ORDER ITEM. PLEASE CONTACT OR LEAVE A NOTE IN THE COMMENTS BOX REQUESTING ESTIMATED WAIT TIME FOR SHIPPING The EnviroLink is an accessory item that can be ordered for the EnviroVent and Envirovent 2 that works in conjunction with the Skutt KilnMaster or GlassMaster controller. It allows you to program the controller to automatically turn the vent on and off throughout a firing program. You simply enter an on/off setting for each segment of a Ramp and Hold program while you are programming the kiln. There are preset "vent programs" that can be run in conjunction with a ConeFire Mode program as well.