Re-entrable Duct Seals

Our re-enterable duct seal systems are engineered for environments where adaptability is essential. Designed to offer robust defence against water, gas, smoke, fire and rodent ingress, these seals allow easy access for upgrades, maintenance or service changes, without compromising safety or performance.

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Trusted for over 30 years

Explore our Re-Enterable Sealing products

Ideal for substations, utilities, telecoms, and transport infrastructure, these solutions reduce downtime, simplify installation, and provide long-term peace of mind.

NOFIRNO® Rapid Duct Seal

A fast-install, high-performance sealing system designed for speed-critical or restricted-access environments, offering reliable, water and gastight protection with full re-entry capability.

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SLIPSIL® Sealing Plugs

Maintenance-free, tool-less installation for single or trefoil cable and pipe penetrations, providing a gas and watertight seal that remains fully re-enterable without the need for mechanical fixings.

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Need help choosing the right duct seal?

Our team is ready to help you specify the right solution for your site conditions and future access needs.

“CSD Technical Services delivered the water, and gastight sealing works to a high standard across our control room and DNO substation. Their support contributed effectively to our wider climate action plan, including the installation of a new solar farm and battery storage system. We were very satisfied with the work and will be considering CSD for future projects.”

CSD client

Morrison Data Services