The Sika Greenstreak X-Plug is a patented mechanical plug engineered to permanently seal taper tie voids in concrete walls left by the removal of taper tie rods or pass-through tie sleeves. Designed for water-retaining and water-excluding concrete structures, the X-Plug delivers a proven liquid-tight seal rated to nearly 300 ft of head pressure — without the need for grout, epoxy, or bentonite rope. It is the go-to taper tie void plug for contractors working on demanding infrastructure projects where a reliable, long-lasting seal is non-negotiable.
At the core of the X-Plug is a high-performance EPDM rubber expansion system. When the stainless steel nut is tightened, the rubber plug expands radially inside the taper tie void, increasing its diameter against the void wall while simultaneously compressing the main body onto the bolt to form a liquid-tight seal. The plug seats at 50–60% of wall thickness, ensuring optimal placement and consistent performance across varying wall dimensions.
The 304 stainless steel bolt is compression set at 50 lbs. into the rubber grommet to prevent spinning during installation, making for a faster and more reliable tightening process. A Xylan coating applied to the bolt provides an additional 500–1,000 hours of corrosion resistance per ASTM B1117 Salt Spray Testing, while also serving as an anti-galling and anti-seizing agent — an important feature in wet, chemically active, or below-grade environments.
The X-Plug is available in six sizes to accommodate taper tie voids ranging from 5/8″ to 1-1/2″ and is suitable for use in water and wastewater treatment facilities, pump stations, sewage screening facilities, liquid chlorination facilities, ground storage facilities, flood control and levee structures, foundations, and any structure designed to be liquid-tight. For chemical containment applications, consult a Sika Greenstreak engineer to confirm compatibility with your specific environment.
Key Features
The X-Plug is built around a simple but highly effective mechanical design. When installed, the EPDM rubber expansion system creates a watertight compression seal inside the taper tie void — capable of withstanding water head pressure up to nearly 300 feet — eliminating the need for grouting, epoxy, or other secondary sealing materials in most applications.
Durability is built in at every component level. The 304 stainless steel bolt resists corrosion in wet and chemically active environments, while a Xylan coating adds an additional layer of protection against harsh conditions, preventing galling and seizing during and after installation.
Installation is straightforward and fast. Using a standard handheld drill with a 7/16″ extension, the X-Plug can be installed in a fraction of the time required by non-mechanical alternatives. Available in six sizes and supplied in color-coded pails for easy jobsite identification, the right size X-Plug is always within reach.
Technical Specifications
| Specification | Value |
|---|---|
| Material | EPDM rubber, 304 stainless steel bolt with Xylan coating |
| Pail Quantity | 300-500 |
| Compression Resistance | 34.5% (ASTM D395) |
| Tensile Strength | 13.2 MPa (ASTM D412) |
| Elongation | 410% (ASTM D412) |
| Water Absorption | < 3.5% (ASTM D471) |
| Storage Conditions | Store in original, unopened container |
Frequently Asked Questions
How does the Sika Greenstreak X-Plug work? When the stainless steel nut is tightened, the EPDM rubber plug expands radially inside the taper tie void, pressing firmly against the void walls while simultaneously compressing the main body onto the bolt to create a secure, liquid-tight seal.
Where can the X-Plug be used? The X-Plug is commonly used in water and wastewater treatment facilities, pump stations, parking structures, basements, flood control structures, foundations, and any concrete structure requiring a watertight seal for taper tie voids.
Does the X-Plug require additional grouting? No. The X-Plug creates a watertight seal on its own, rated to nearly 300 ft of head pressure. Grouting after installation is optional and purely for aesthetic purposes.
What tools are needed for installation? Installation requires only a standard handheld drill with a 7/16″ extension. The X-Plug can be installed up to 6 times faster than non-mechanical alternatives, significantly reducing labor time and costs on the jobsite.
What sizes does the X-Plug come in? The X-Plug is available in six sizes to accommodate taper tie voids ranging from 5/8″ to 1-1/2″. Each size is supplied in a color-coded pail for easy identification on the jobsite.
Is the X-Plug suitable for chemical containment applications? The X-Plug is compatible with many chemical containment environments, but not all. Consult a Sika Greenstreak engineer to confirm suitability for your specific chemical environment before use.
How deep does the X-Plug seat in the wall? The X-Plug is designed to seat at 50–60% of the wall thickness when the correct size is selected, ensuring proper placement and a reliable seal regardless of wall depth.
Can the X-Plug be used in cold weather? Yes, but at below-freezing temperatures it is recommended to store the X-Plug in a warm environment prior to installation to ensure maximum performance of the EPDM rubber during the sealing process.
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