Large Stack Gasket – 3-1/2" x 19" | 631219 | B-57 Big Stack Gasket

Large Stack Gasket – 3-1/2" x 19" | 631219 | B-57 Big Stack Gasket

Seal uneven stove-to-stack connections with the 631219 Large Stack Gasket. Designed for use with the 9S17312 transition stack (3-1/2" x 17" x 8" round), this high-temperature fiberglass gasket ensures a tight, leak-proof seal between your stove and flue system. Perfect for installations where precision sealing is critical to safety and performance.

Key Features:

• OEM Fit – Designed specifically for the 9S17312 transition stack
• High-Temp Fiberglass – Withstands high heat and pressure without breaking down
• Air-Tight Seal – Prevents smoke leaks and helps maintain proper stove draft
• Easy Installation – May require T-bolts or tie-downs for secure mounting

Product Specifications:

• Part Number: 631219
• Also Known As: B-57 Big Stack Gasket
• Inner Dimensions: 3-1/2" x 17"
• Outer Dimensions: 4-5/8" x 19"
• Material: Heat-resistant fiberglass
• Application: Stack-to-pipe transition seal

Compatible Stove Brands:

• Buck
• Craft
• Carolina
• Appalachian
• Hawke
• Lilly Stoves
• Silent Flame
• Squire
• Long Manufacturing
• And many others—refer to your owner’s manual for part number compatibility

When to Replace:

• During new stove or stack installation
• If the current gasket shows cracks, wear, or air leaks
• As part of routine maintenance to ensure proper sealing

Ensure safe, efficient operation with the 631219 Large Stack Gasket. Order today for a reliable fit and improved heating performance in your stove system!