Description
Z400-3.5-U-EXT / ZN400-3.5-U-EXT Adjustable Strainer Extension – 3-1/2″ Threaded
The Z400-3.5-U-EXT (cast iron) and ZN400-3.5-U-EXT (nickel bronze) are Type U adjustable strainer extensions designed to accept 3-1/2″ threaded shanks, providing installation flexibility and elevation adjustment in finished flooring applications. These extensions are ideal for pairing with the Z415 floor drain body system, helping to fine-tune the height of strainers during new installs or rework projects.
With a 3-7/8″ MIP x FIP thread diameter, the extension allows for vertical adjustability while maintaining a secure fit in commercial and light industrial drainage setups. Choose between cast iron for rugged utility or nickel bronze for a more polished, visible finish.
Key Features:
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Thread Size: 3-7/8″ MIP x FIP – accepts 3-1/2″ threaded shanks
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Available in two material options:
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Z400-3.5-U-EXT: Cast iron for durability in heavy-use areas
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ZN400-3.5-U-EXT: Nickel bronze for aesthetic, exposed applications
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Designed for use with Z415 and compatible floor drain systems
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Ideal for flush installation with tile, concrete, or finished floors
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Supports quick adjustments during retrofit or new installations
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Alternate search terms: Z400U, Z400-U, ZN400U, ZN400-U, 400-U
Whether you’re working with high-traffic commercial areas or updating an existing drain layout, this strainer extension makes leveling and alignment simple and precise.
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