Lochinvar & A.O. Smith 100330219 Gasket Kit

The Lochinvar & A.O. Smith 100330219 4" Flue Gasket Kit is an OEM replacement flue outlet gasket designed to restore the seal at the vent connection on compatible commercial heating equipment.

Lochinvar factory replacement-parts documentation identifies part 100330219 as the flue outlet gasket for KBX0400 and KBX0500 models, with additional applications in corresponding APX0400-0500 and AWH0400-0500 equipment.

The gasket is designed for a 4-inch flue connection and helps maintain the proper seal where the flue outlet interfaces with the vent assembly. When replacing a Lochinvar flue gasket, inspect the mating surfaces, flue outlet, and clamp components for damage, corrosion, or residue that could prevent proper seating.

This boiler flue gasket should be selected by exact equipment model and part number rather than vent diameter alone. Always verify the complete equipment model and serial number before ordering.

Key Benefits

• OEM Lochinvar 100330219 flue gasket
• Designed for a 4-inch flue outlet
• Factory-listed for KBX0400 and KBX0500
• Also listed for compatible APX0400-0500 and AWH0400-0500 equipment
• Helps maintain the required seal between the flue outlet and vent connection
• Replaces discontinued Lochinvar GKT20003

Common Questions

What equipment uses the Lochinvar 100330219 flue gasket?
Lochinvar factory parts documentation lists 100330219 for KBX0400-0500, APX0400-0500, and AWH0400-0500 model ranges. Always verify the complete model and serial number before ordering.

Does 100330219 replace Lochinvar GKT20003?
Yes. Current replacement references identify 100330219 as the replacement for the discontinued GKT20003 4" flue collar gasket.

Can this gasket be selected only by the 4-inch flue size?
No. Flue diameter alone does not confirm compatibility. Match the OEM part number and verify the equipment model and serial number before installation.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.