15/16in Quick Patch for Corner Pulley Quick-Seal #682 - #1492
The Evergreen 1492 Quick-Patch is a permanent, liquid-tight blind mechanical seal specifically sized for 15/16" (23.8 mm) holes -- the opening left by Ansul-style Quick-Seal #682 pulley adapters. Under NFPA 96, every hood penetration must be grease-tight to prevent flammable runoff from migrating into wall cavities. The 1492 restores this liquid-tight envelope using a nickel/chrome plated carbon steel body and a high-temperature gasket, with no welding or hot-work permits required.
The nickel/chrome finish matches professional stainless steel hardware aesthetically while providing a sacrificial corrosion barrier against the high-alkaline degreasers used in commercial hood cleaning. Available individually (P/N 1492) or in a 24-pack (P/N 1489), the 1492 is a standard inventory item on service vans for fire protection contractors performing kitchen system overhauls.
Compression Seal and Thermal Cycling Resilience
The 1492 sandwiches the hood material between the plated cap and a high-temperature gasket. As the nut is tightened, compressive force creates uniform surface pressure across the gasket face, causing the gasket material to flow into the microscopic irregularities of the stainless steel and create a gas-tight interlock. The gasket expansion coefficient is matched to standard hood materials, preventing thermal weeping as the plenum cycles from ambient temperature to over 400°F (204°C) during peak cooking hours.
| Feature | Details |
|---|---|
| Manufacturer | Evergreen Fire Protection |
| Part Number | 1492 (single) / 1489 (24-pack) |
| Hole Size | 15/16" (23.8 mm) |
| Primary Target | Replaces Quick-Seal #682 pulley adapter holes |
| Material | Nickel/chrome plated carbon steel |
| Seal Type | High-temperature, grease-proof gasket |
| Fitting Type | Blind mechanical patch (liquid-tight) |
| Compliance | NFPA 96 |
Surface Decontamination
Thoroughly scour the area around the hole with a heavy-duty degreaser before installation. Grease acts as a natural lubricant that can cause the gasket to shift or extrude under compression, preventing a centered, liquid-tight seat.
Gasket Seating
Ensure the gasket is seated perfectly flush and square against the patch body before insertion. An off-center gasket is the leading cause of slow-drip leaks at sealed penetrations.
Wrench-Tightening and Verification
Hand-start the nut to align the assembly, then finish with a wrench to fully engage the lock washer. A properly installed 1492 shows a slight, uniform compression of the gasket around the edges of the chrome cap -- this visible bulge is the standard AHJ walkthrough verification of a liquid-tight seal.
Semi-Annual Audit
During semi-annual inspections, verify all patches remain secure and the gasket shows no signs of weeping or separation from the cap edge. Document the check in the fire safety service log as part of the routine hood inspection record.
Is this patch compatible with 7/8-inch pulley holes?
No. The 1492 is sized for 15/16" holes common in Ansul-style #682 systems. For the smaller 7/8" holes, use the Evergreen 1476. Using a larger patch in a smaller hole prevents a centered seat and will produce a non-compliant seal.
Does the Quick-Patch require specialized tools?
No. The 1492 is a mechanical fitting that achieves a liquid-tight seal using basic hand tools in minutes, with no welding equipment or hot-work permits required.
Is the gasket rated for active exhaust plenum temperatures?
Yes. The high-temperature gasket is engineered to maintain its seal under the sustained thermal conditions of an active exhaust plenum, including the rapid temperature swings between ambient and peak cooking temperatures.
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