Simpson Adhesive Piston Plugs 7/8 inch are precision-fit plastic plugs designed for use with the Simpson Piston Plug Delivery System, a system purpose-built for dispensing anchoring adhesive into drilled holes for threaded rod and rebar dowel installations. The matched tolerance design between the piston plug and the drilled hole virtually eliminates the formation of voids and air pockets during adhesive dispensing, supporting consistent, reliable anchor performance across overhead, upwardly inclined, horizontal, deep embedment, and submerged (underwater) concrete conditions. A barbed end provides a reliable connection to the flexible extension tubing, and the model number is embossed directly on each plug for quick field identification. This pack contains 10 plugs sized to fit a 7/8 in. drilled hole diameter.

Key Features

• Matched tolerance design virtually eliminates voids and air pockets - adhesive is dispensed consistently along the full embedment depth, reducing the risk of weak spots or failed anchors.
• Model number embossed on each plug - allows installers to quickly confirm they have the correct plug size on the job site, reducing costly mix-ups.
• Compatible with any Simpson anchoring adhesive - provides flexibility to use the plug across a wide range of adhesive anchor applications without needing additional hardware.
• Suitable for glued-in-rod (GIR) installations in timber when paired with Timber-SET structural epoxy anchoring adhesive - consistent adhesive distribution supports bond quality along the embedment depth for high-strength GIR connections, expanding the plug's utility beyond concrete applications.
• Designed for use in a variety of orientations and embedment depths - performs in overhead, upwardly inclined, horizontal, deep embedment, and submerged (underwater) concrete conditions, making it a single solution for demanding installation scenarios.
• Barbed end connection to flexible extension tubing - provides a reliable, secure fit during adhesive dispensing so the delivery system stays in place throughout the installation.
• Sized specifically for 7/8 in. drilled hole diameter - the precise fit is what enables consistent adhesive placement, so using the correctly sized plug is essential to anchor performance.

Why This Product

• Engineered to virtually eliminate voids - the matched tolerance fit between plug and drilled hole means adhesive fills the hole consistently from the bottom up, which is critical for meeting load requirements in structural anchor installations.
• Handles the most challenging installation conditions - whether working overhead, at an incline, underwater, or at deep embedments, this piston plug is specifically designed for conditions where adhesive control is hardest to achieve and most important to get right.
• Expands beyond concrete to timber GIR applications - when paired with Timber-SET structural epoxy anchoring adhesive, the PP87 plug supports glued-in-rod connections in timber, making it a versatile tool for contractors working across multiple structural materials.
• Embossed model identification on every plug - eliminates guesswork when managing multiple plug sizes on a job site, helping crews stay organized and install with confidence.

Specifications

• MPN: PP87-RP10
• Brand: Simpson Strong-Tie
• Hole Diameter: 7/8 in.
• Material: Plastic
• Packaging: Packs of 10 and Cartons of 100

Approved Applications

• Threaded rod and rebar dowel adhesive installations in overhead orientations
• Threaded rod and rebar dowel adhesive installations in upwardly inclined orientations
• Threaded rod and rebar dowel adhesive installations in horizontal orientations
• Deep embedment adhesive anchor installations
• Submerged (underwater) concrete adhesive anchor installations
• Glued-in-rod (GIR) installations in timber when paired with Timber - SET structural epoxy anchoring adhesive

Frequently Asked Questions

What is the purpose of the Simpson PP87-RP10 Adhesive Piston Plug?

The PP87-RP10 is designed for use with the Simpson Strong-Tie Piston Plug Delivery System to dispense adhesive into drilled holes for threaded rod and rebar dowel installations. Its matched tolerance design virtually eliminates the formation of voids and air pockets during adhesive dispensing, helping ensure consistent and reliable anchor performance.

What hole diameter is this piston plug sized for?

This piston plug (model PP87) is specifically sized to fit a 7/8 in. drilled hole diameter.

Can this piston plug be used with any Simpson Strong-Tie anchoring adhesive?

Yes. The PP87-RP10 works with any Simpson Strong-Tie anchoring adhesive. It can also be used for glued-in-rod (GIR) installations in timber when paired with Timber - SET structural epoxy anchoring adhesive.

How does the piston plug connect to the delivery system tubing?

The piston plug features a barbed end that provides a reliable connection to the flexible extension tubing used in the Simpson Strong-Tie Piston Plug Delivery System.

Note: Product dimensions may differ from picture. Please see the item description above for specifications.