DuraVent FasNSeal Drain Fitting: a drain cap for the bottom of a vertical vent
The DuraVent FasNSeal Drain Fitting is a stainless steel cap with a drain tube. It replaces the plain cap on the bottom opening of a tee, the fitting that joins a side branch to a vertical vent. This gives condensate, the acidic liquid that drips from the exhaust, a way out of the stack. DuraVent requires a drain at the bottom of every vertical stack. FasNSeal is DuraVent’s stainless steel vent for high efficiency gas boilers, furnaces, and water heaters, built to carry pressurized exhaust and its acidic condensate outside.
Choose a 3, 4, or 5 inch size to match your vent. The drain has a 5/8 inch tube for connecting plastic tubing. For vents 6 inches and larger, the IPS drain fitting handles this job instead. The drain hose needs a loop that traps liquid, and it must stay indoors in cold climates. A gasket and a locking band built into the wide end seal and secure the vent connection. Need the double wall version? See the DuraVent FasNSeal W2 Drain Fitting drain cap. The DuraVent FasNSeal Drain Fitting ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.








Commercial projects may require custom parts and unique system designs. Duravent offers complete project assistance:








































