Quick Seal for Corner Pulley (15/16-20 x 1/2" NPT) #682
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Wholesale PricingThe Evergreen 682 Quik-Seal® Corner Pulley Adapter is a precision-engineered, liquid-tight sealing solution designed to solve the most difficult challenge in fire suppression installation: achieving a code-compliant, grease-tight seal where a mechanical detection line penetrates a commercial kitchen hood or exhaust duct. Traditionally, these penetrations required high-skill, in-field welding, a process that is time-consuming and prone to warping thin-gauge stainless steel. The Evergreen 682 eliminates these variables, providing a weld-equivalent mechanical seal in a fraction of the time.
Specifically designed to interface with Ansul, Pyro-Chem, and Heiser corner pulleys, the 682 acts as the structural anchor for the 1/16" stainless steel cable network. Manufactured from machined carbon steel and finished with a premium nickel/chrome plating, it provides the structural integrity needed to withstand the mechanical forces generated during a system discharge while maintaining a professional aesthetic.
High-Temperature Gasket Kinetics
The heart of the Quik-Seal® technology is a specialized, pliable gasket that remains resilient under extreme thermal cycling. In a commercial exhaust duct, the gasket maintains a constant compression seal, preventing aerosolized grease and liquid fats from leaking, a primary cause of fires occurring behind the hood line.
5,000 PSI Internal Pressure Rating
The Evergreen 682 is tested to a 5,000 PSI internal pressure rating. This ensures the adapter will not shear or deform during the snap-tension event of a system discharge, protecting the continuity of the mechanical detection line.
Nickel/Chrome Plated Metallurgy
Kitchen exhaust environments are chemically aggressive. The 682 features a nickel/chrome plated metallurgy that resists the corrosive effects of airborne acetic acids, ensuring the threads remain viable for the system's entire service life and allowing for easy pulley replacement during 12-year overhauls.
Hot-Work Permit Elimination
Welding inside an active kitchen requires hot-work permit oversight and fire watches. The 682 allows for a cold-installation requiring only a standard drill and a wrench, significantly increasing installation efficiency and reducing labor hours on a typical multi-pulley install.
Structural Integrity vs. Sheet Metal Distortion
Welding thin-gauge hoods often leads to thermal distortion. The mechanical compression of the 682 applies even pressure across the 1-1/8" hole, reinforcing the hood surface rather than weakening it with heat.
Universal Adapter Matrix
The 682 features 15/16-20 UNS x 1/2" NPT threading, allowing it to host corner pulleys from the world's largest fire suppression manufacturers. This allows service companies to standardize their truck stock across multiple system brands.
- Commercial Kitchen Hoods: Providing a liquid-tight seal for detection line penetrations in plenums and ducts.
- Exhaust Duct Entries: Ensuring a grease-tight anchor point for the transition from interior hood to exterior conduit.
- Heavy-Duty Vehicle Suppression: Passing detection lines through thick metal bulkheads in mining and forestry machinery where high-amplitude vibration is constant.
- Industrial Enclosures: Providing a liquid-tight penetration for fire suppression lines in hazardous material lockers.
- Retrofit Modernization: Replacing leaky or non-compliant welded penetrations with a modern, mechanical solution.
| Feature | Details |
|---|---|
| Manufacturer | Evergreen |
| Part Number | 682 (Box Qty #893) |
| Interface Threads | 15/16-20 UNS x 1/2" NPT |
| Body Material | Machined Carbon Steel |
| Finish | Nickel/Chrome Plating |
| Internal Pressure Rating | 5,000 PSI |
| Hole Size | 1-1/8" (28.6 mm) |
| Compliance | UL/ULC Listed, NFPA 96, 17, 17A |
Liquid-Tight Verification
After installing the 682, perform a visual light-test or soap-bubble test to verify the compression gasket has seated perfectly. NFPA 96 requires all penetrations to be liquid-tight to prevent grease leakage.
Precise Torque Application
To achieve the 5,000 PSI rated seal, the nut should be tightened to approximately 50 ft-lbs. Under-tightening allows grease to seep through the threads, while over-tightening can crush the gasket.
Axial Alignment Audit
When screwing the pulley into the 682, ensure the cable path is perfectly axial. Any side-loading of the cable creates friction, potentially slowing the response time of the system.
Grease-Tracking Inspection
During every 6-month inspection, check the exterior for grease-tracking. If grease is found around the base, the gasket may have dried out or the nut loosened due to vibration, requiring immediate replacement.
Is the Evergreen 682 "weld-equivalent" according to the Fire Marshal?
Yes. Because it is UL Listed for hood and duct penetrations, it is recognized as a code-compliant alternative to a continuous liquid-tight weld as defined in NFPA 96.
Can I use this with 3/4" conduit?
No. The 682 is specifically designed for 1/2" NPT interfaces, which is the standard for fire suppression corner pulleys and EMT conduit runs.
Does the 682 include the corner pulley?
No. The 682 is the adapter and gasket assembly. The corner pulley (Ansul, Pyro-Chem, etc.) must be purchased separately to complete the routing junction.
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