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White plastic quart bottle with red and black label

Silver King Manufacturing Co.

Silver King SBSL 1 Quart Boiler Stop Leak SK-24

SKU CH-NR03-ERF60

One-quart liquid seals leaks in steel and cast-iron boilers, compatible with glycol anti-freeze and safe for steam or hot-water systems

  • Product typeDrain Components
  • Sold asEach
  • Stops leaks in steel and cast iron boilers
  • Safe formula contains no petroleum or hazardous components
  • Will not sludge submerged coils or clog system passages
  • Compatible with propylene glycol and ethylene glycol anti-freeze
  • Treats steam boilers up to 650 ft radiation per quart

1-Quart Boiler Stop Leak SK-24

Silver King SBSL SK-24 is a one-quart liquid sealant designed to stop leaks in steel and cast-iron boilers. It serves both steam and hot-water heating systems, including baseboard, copper piping and radiant installations. The formula contains no petroleum and is non-hazardous for residential or commercial use.

Installation and common issues

Pour the required amount directly into the boiler water through a convenient opening while the system is off and cool, then circulate by firing the boiler. Over-dosing beyond the stated ratios can reduce effectiveness, and the product will not repair structural cracks or leaks in components that are not submerged in system water. Always verify system volume before adding.

Dosage by boiler rating and radiation

Use one quart for every 110,000 BTU of boiler rating, one quart per 650 feet of steam radiation or one quart per 400 feet of hot-water radiation. These three ratios are the only guides supplied for determining the correct quantity.

How it compares

Measured against everything we stock in Drain Stoppers, Strainers & Traps, at today’s prices. Recalculated every night.

Price $28.99
Typical for this category: the median of 4,240 items is $31.99.

Specifications

Product
Product typeDrain Components

Questions about this item

How can I confirm the stop leak has sealed the boiler after adding it?

After adding the product, monitor the boiler for the absence of water loss and steady pressure over several heating cycles; the formulation creates a water-insoluble seal in steel and cast iron boilers without surging or sludge.

What comes in the package and do I need any extra tools or chemicals?

The bottle contains one quart of Silver King SBSL liquid stop leak with anti-foam silicone; no additional chemicals or tools are required for application.

Which size should I choose for my system?

Only the one-quart SK-24 is offered; use one quart per 110,000 BTU boiler rating, one quart per 650 feet of steam radiation, or one quart per 400 feet of hot water radiation.

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