Minerallac 67742 Foam Conduit Piston 3/4 Inch

Product Description

The MINERALLAC 67742 is a 3/4 inch foam conduit piston designed to seal conduit openings against air infiltration, moisture, and pests. Foam conduit pistons are inserted into conduit ends after wiring is pulled, expanding to fill the annular space around conductors and create an effective barrier. Electricians and low-voltage installers use these fittings to meet code requirements for conduit sealing at building penetrations and equipment enclosures. The 67742 fits 3/4 inch trade-size conduit and is lightweight at approximately 0.03 pounds, making it practical to stock in quantity on service trucks.

Foam conduit pistons like the MINERALLAC 67742 are commonly used in residential and commercial electrical installations wherever conduit enters conditioned spaces, control panels, or weatherproof enclosures. Typical applications include exterior wall penetrations, underground conduit stub-ups, and HVAC equipment conduit entries where air sealing is required by NEC or local mechanical codes. The piston format allows installation around existing conductors without disturbing the wire pull.

Key Features

• Sized for 3/4 inch trade-size conduit
• Foam construction seals around conductors to block air, moisture, and pests
• Lightweight at approximately 0.03 pounds for easy bulk handling
• Installs over existing conductors without requiring a wire repull
• Suitable for conduit penetrations at building envelopes and equipment enclosures

Compatibility

Designed as an OEM-style sealing accessory for 3/4 inch trade-size conduit systems in residential and commercial electrical installations.

Installation Notes

Installation is performed by licensed electricians or low-voltage technicians. De-energize all circuits in the conduit before beginning work at any conduit termination. Insert the foam piston into the conduit end and seat it firmly around the conductors to ensure full annular coverage. Refer to NEC Article 300 and any applicable local codes for conduit sealing requirements at fire-rated or exterior building penetrations.

Technical Specifications

• Conduit Size: 3/4 inch
• Weight: 0.03 pounds
• UPC: 08593767742

Standard Information

• Brand: MINERALLAC
• Manufacturer Part Number: 67742