1/2" Quick Seal #171

The Evergreen 171 Quik-Seal® Adapter is a precision-engineered, liquid-tight penetration seal designed to solve the structural and regulatory challenges of routing fire suppression discharge piping through commercial kitchen hoods and ducts. In a professional fire safety installation, the point where a 1/2" NPT pipe passes through the stainless steel hood is a critical vulnerability. The Evergreen 171 provides a weld-equivalent piping standard that prevents grease and flammable vapors from escaping the exhaust plenum, achieving a code-compliant finish without the distortion, fire watch, or high labor costs associated with on-site welding.

Manufactured from solid machined carbon steel and finished with a premium nickel-chrome plating, the 171 is designed to withstand the extreme mechanical forces generated during a high-pressure agent discharge. Whether integrated into an Ansul, Pyro-Chem, or Heiser system, the 171 penetration seal ensures that the discharge piping remains securely anchored and perfectly aligned. For contractors, this adapter is the definitive solution for high-volume retrofits and new construction, offering a clean-room aesthetic that satisfies health inspectors and fire marshals alike.

High-Compression Gasket Kinetics

The 171 utilizes a specialized high-temperature, pliable gasket that creates a permanent, grease-tight barrier against the stainless steel surface. As the 1-1/2" body is tightened, the gasket compresses to fill microscopic irregularities in the hood surface, ensuring a high-compression seal that meets the NFPA 96 liquid-tight standard.

5,000 PSI Snap-Recoil Rating

The 171 is tested to an internal pressure of 5,000 PSI. This extreme rating ensures the adapter can absorb the snap-recoil of a system activation without compromising the seal or damaging the thin-gauge stainless steel of the hood.

Industrial Nickel-Chrome Plating

Kitchen exhaust environments are chemically aggressive, subject to aerosolized fats and caustic cleaning degreasers. The industrial nickel-chrome finish prevents pitting corrosion, ensuring that the 1/2" NPT threads remain viable for the system's entire service life and facilitate easy maintenance or nozzle adjustments.

Elimination of Hot-Work Protocols

Welding inside an active kitchen requires a fire watch, specialized equipment, and significant prep time. The 171 allows for a cold-installation requiring only a standard drill and wrench. This can reduce labor time for a multi-tank retrofit by several hours.

Structural Reinforcement Logic

Unlike welding, which can warp thin-gauge stainless steel, the mechanical compression of the 171 reinforces the penetration point. The wide-body design provides superior mechanical stress distribution, preventing the discharge pipe from vibrating or sagging during use.

Standardization for Service Fleets

By standardizing on this SKU (Box Qty #847), service providers ensure their technicians have the correct weldless pipe anchor for Ansul, Pyro-Chem, and Heiser systems on every truck, simplifying inventory management and reducing site-return rates.

• Commercial Kitchen Hoods: Anchoring 1/2" NPT discharge piping through stainless steel hood surfaces with a liquid-tight, grease-resistant seal.
• Exhaust Duct Penetrations: Providing a code-compliant penetration point for piping transitions between the interior plenum and exterior conduit runs.
• Laboratory and Pharmaceutical Cleanrooms: Routing fire suppression lines through metal bulkheads into sterile areas where welding is prohibited due to particle contamination.
• Multi-System Retrofits: Universal adapter for Ansul, Pyro-Chem, and Heiser suppression systems, simplifying fleet inventory across multiple brands.
• New Construction: Providing a clean, professional aesthetic finish at discharge pipe penetration points that satisfies AHJ inspections.

NPT Pipe Sealing Protocol

When installing the discharge pipe into the 1/2" NPT threads, use a standard pipe sealant to achieve a liquid-tight seal. The pipe should be threaded until mechanically secure to prevent vibration-induced leaks.

Gasket Compression Audit

After tightening the 1-1/2" nut, verify that the gasket has compressed evenly around the entire circumference of the 1-1/8" hole penetration. Any bulging or gaps indicate a misaligned fitting that could allow grease to seep behind the hood.

Visual Inspection Cycle

During every 6-month fire inspection, the exterior of the 171 should be checked for signs of grease tracking. If residue is found, it indicates the gasket has dried out or the nut has loosened, necessitating immediate re-torque or replacement.

Structural Anchoring Protocol

Ensure the adapter is tightened firmly to the hood surface to serve as a penetration point anchor. This stabilizes the piping and prevents snap-recoil forces from damaging downstream components during system activation.

Is the 171 compatible with stainless steel discharge pipe?

Yes. The 1/2" NPT threads are compatible with both black iron and stainless steel piping. The industrial nickel-chrome finish prevents the galvanic corrosion that can occur when dissimilar metals are joined in a humid environment.

What is the difference between the 171 and the 682?

The Evergreen 171 features 1/2" NPT threads for discharge piping. The Evergreen 682 features a 15/16" thread interface specifically for corner pulleys. While they look similar, they are not interchangeable for discharge piping penetration seal applications.

Does this adapter fulfill the "Liquid-Tight" requirement for NFPA 96?

Yes. Because the Evergreen 171 is UL Listed as a hood and duct accessory, it is recognized by the Authority Having Jurisdiction (AHJ) as a code-compliant alternative to a continuous liquid-tight weld.