Arlington 664 Sill Plate with Screws and Duct Sealing Compound, Wire Sizes (3) 3/0 to (3) 4/0, Cast Aluminum

Keep large-gauge power and communications cabling secure and weatherproof with the Arlington Industries 664 sill plate conduit adapter. Engineered for exterior mast and conduit entries, this cast aluminum sill plate protects critical security, surveillance and monitoring cabling while providing a clean, durable pass-through for heavy conductors. The 664 supports (3) 3/0 to (3) 4/0 wire configurations, and ships complete with mounting screws and duct sealing compound so you get a reliable, airtight seal right out of the box. At a compact 3.68" width and 6.21" height, the plate installs easily on sills and mast mounts without adding bulk, helping you maintain tidy, code-conscious routing for power and networking runs. Corrosion-resistant construction reduces maintenance and downtime in harsh outdoor environments, making it ideal for installers working on security camera systems, access control power feeds, and remote monitoring sites. Streamline your next installation with a robust conduit transition that protects cabling and boosts longevity—order the Arlington 664 sill plate today.

• Provides a weatherproof, airtight transition for mast and conduit entries to protect critical cabling for security and surveillance systems
• Built-in capacity for large conductors, handling (3) 3/0 to (3) 4/0 conductors to simplify heavy-gauge installations
• Durable cast aluminum construction resists corrosion for long service life on exterior installations
• Includes screws and duct sealing compound to speed installation and ensure a reliable seal for monitoring and networking cables
• Compact 3.68" x 6.21" profile that mounts neatly on sills and reduces installation time for electricians and low-voltage contractors