DuraVent FasNSeal Bosch, Thermo Dynamics, and Laars Appliance Adapter: a 4 inch connection for three listed appliances
The DuraVent FasNSeal Bosch, Thermo Dynamics, and Laars Appliance Adapter is a 4 inch adapter that connects a FasNSeal vent to an appliance’s exhaust outlet. DuraVent lists it for the Bosch Aquastar 125 FX, Laars Mini Therm JVi, and Thermo Dynamics LMGD Series. 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. For these three models, the connection at the appliance needs high temperature RTV silicone sealant. The sealant is not included.
The vent needs to stay FasNSeal all the way from the appliance to the outdoors. DuraVent says not to mix in another vent maker’s pipe, fittings, or joining methods because their connections seal differently. Each FasNSeal part has a gasket and locking band built into its wider end to seal and hold the next part. Have a Laars Endurance instead? See the DuraVent FasNSeal Laars Endurance Series Appliance Adapter. The DuraVent FasNSeal Bosch, Thermo Dynamics, and Laars Appliance Adapter 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:








































