Valterra 4" x 3" Female Threaded Floor Flange — Black, 1.80" Thread Depth, Rugged Molded Mount

The Valterra T05-0784 is a durable black female-threaded floor flange designed to securely join 4" to 3" piping with a 1.80" threaded depth for stable, leak-resistant floor or deck installations.

This compact, American-made flange delivers a dependable connection point where a finished surface meets plumbing or accessory piping. Built for applications that require a low-profile, robust mounting solution, the Valterra floor flange is molded to resist wear while keeping installation straightforward. It’s commonly used in RVs, marine setups, utility areas, and home projects where a neat, threaded transition is needed between different pipe diameters.

How does this flange create a reliable threaded connection?

The flange offers a female threaded bore sized to accept standard threaded fittings, providing a secure mechanical joint without complex adapters. Its molded geometry supports even compression around the mating threads to limit movement and maintain alignment under load.

• Female thread depth: 1.80" for substantial thread engagement
• Compatible with 3" threaded fittings and 4" outer flange footprint
• Secure mounting flange to fasten to floor or deck surfaces

What materials and construction features make it suitable for heavy use?

Manufactured in the United States, this Valterra flange uses resilient materials that stand up to repeated handling and environmental exposure. The black finish masks wear and is compatible with common installation aesthetics, while the molded design resists deformation under moderate stress.

• Made in the United States for consistent quality control
• Rigid molded body resists bending and cracking
• Black finish hides scuffs and blends with dark hardware

How do you install and fasten the floor flange?

Installation is straightforward: place the flange over the opening, align the mounting holes, and secure it with appropriate fasteners for your substrate. Thread the mating fitting into the female bore, using thread sealant or tape where a fluid-tight seal is required.

• Mounting compatible with wood, composite, or solid deck materials
• Use corrosion-resistant screws or bolts sized to flange holes
• Apply PTFE tape or thread sealant when connecting fluid lines

Will this flange adapt between pipe sizes in my project?

Yes — the part bridges a 4" flange footprint with a 3" threaded connection, making it useful where pipe size transitions or accessory attachments are needed. It’s engineered to provide a compact, tidy junction without bulky adapters.

• 4" outer flange dimension for secure surface mounting
• 3" female threaded bore for standard threaded fittings
• 1.80" thread depth for firm engagement of threaded parts

Who this is for: installers, RV owners, marine technicians, and DIYers who need a compact, reliable floor-mount flange to join a 3" threaded fitting to a 4" mounting footprint. If you want a low-profile, sturdy flange built in the U.S. that simplifies transitions between pipe sections or secures accessories to floors and decks, the Valterra T05-0784 is a practical choice.

Product details: 4" x 3" x 1.80" female threaded floor flange; black finish; package dimensions approximately 5.0 cm L x 18.0 cm W x 22.0 cm H; package weight about 0.46 lbs; product type: auto accessory; country of origin: United States.