3M Wall Duct WMD 41/16 (DE999965861) - Gas & Watertight Wall Feed-through for 16 mm Cables/Pipes

Electricians and plumbers installing cables or pipes through exterior walls need a reliable seal against water and gas ingress. The 3M Wall Duct WMD 41/16 provides a gas- and watertight feed-through for a single cable or pipe with an outer diameter of 16 mm. It is installed in a core-drilled hole with a diameter of 60 mm in concrete, masonry, or similar building materials. The duct body is made of polypropylene (PP) and the integrated seals are made of EPDM, ensuring durability and resistance to common building chemicals. The telescopic design allows the duct length to be adjusted on site, and it withstands water pressure up to 2.5 bar and gas pressure up to 1 bar. Operating temperature range is -5°C to +50°C. UV resistance is limited, so the duct is intended for concealed installation.

Key specifications

• Product type: Wall duct / wall feed-through
• Material: Polypropylene (PP) body, EPDM seals
• Nominal duct size: DN 41
• Compatible cable/pipe outer diameter: 16 mm
• Required core drill hole diameter: 60 mm
• Water pressure resistance: up to 2.5 bar
• Gas pressure resistance: up to 1 bar
• Operating temperature range: -5°C to +50°C
• Installation: For core drilled holes in concrete, masonry, etc.
• Sealing method: Compression sealing with integrated EPDM seals
• Adjustable length: Yes (cuttable/telescopic design)
• Number of entries: 1 (single entry)
• UV resistance: Limited (for concealed installation)
• Chemical resistance: Good against common building chemicals

Why choose it

The WMD 41/16 offers a dependable sealing solution for wall penetrations, preventing moisture and gas migration. Its adjustable length simplifies installation across different wall thicknesses, and the EPDM seals provide a durable, compression-based seal without the need for additional sealants.

Ideal use cases

• Sealing cable or pipe penetrations in basement walls
• Feed-throughs in building foundations
• Installations requiring gas-tight barriers
• Retrofitting existing wall openings

Good to know

The duct is designed for concealed installation due to limited UV resistance. Ensure the core drill hole is exactly 60 mm in diameter for proper fit. The product is supplied as a single unit.