Valterra T38 RV Wye Double Valve Assembly — 3 in. Bayonet x 1-1/2 in. Rotating Hub, Black, Repairable Seals

Valterra T38 is a fixed wye double valve assembly that combines your RV black and grey tank outlets into a single, leak-resistant dump connection for faster, cleaner emptying.

This compact valve assembly fits standard 3" bayonet and hub plumbing to let you use one sewer hose for both the black and grey tanks. Built with ABS bodies, steel shafts and polypropylene paddles, the T38 focuses on durability and serviceability: both gate valves are repairable via removable bolts and replaceable seals so you can swap worn parts without cutting plumbing. The 1-1/2" hub rotates for easier handle access, and the black/grey handles are clearly marked so you always know which gate you’re operating.

How does the T38 make dumping an RV sewer system easier?

The T38 allows you to join black and grey tank drains into a single outlet so you only need one sewer hose. Dump the black tank first, then open the grey tank to rinse the hose and reduce residue buildup, simplifying the process and cutting cleanup time.

• Combines two drains into one 3" bayonet outlet for one-hose operation
• Color-coded handles indicate black versus grey tank control
• Rotating 1-1/2" hub provides better access in tight compartments
• Paddle design and seal gaskets reduce the chance of leaks during use

What materials and construction ensure durability and serviceability?

The assembly uses ABS for the wye, cap, and valve bodies plus polypropylene paddles and steel shafts for strength. Each gate valve is designed to be repairable: bolts can be removed to replace the valve body or seals without cutting into the RV’s plumbing.

• ABS wye and cap resist impact and weather exposure
• Polypropylene paddles provide smooth valve action and chemical resistance
• Steel shafts add long-term structural support
• Removable bolts allow in-place replacement of seals and valve components

Will the T38 prevent leaks and make operation reliable?

The valve uses dedicated seal gaskets that fill gaps around the paddle, helping to block leaks when closed. Note that the paddle is intentionally slightly smaller than the opening to make opening and closing smoother while the seal gaskets maintain a watertight closure.

• Seal gaskets designed to bridge the paddle-to-body gap
• Paddle clearance tuned for easy, reliable operation
• Clearly marked handles reduce operator error when switching tanks
• Cap for the 3" bayonet keeps the outlet protected when not in use

How does installation and maintenance work for this valve assembly?

The T38 mounts into standard 3" hub plumbing and includes a 3" bayonet cap for protection. Routine maintenance is straightforward: remove the valve bolts to service seals or replace gate valve components without cutting plumbing lines.

• Fits common 3" hub and bayonet sewer connections
• 1-1/2" rotating hub simplifies handle access during installation
• Repairable valves reduce long-term replacement costs
• Simple bolt removal exposes internal seals for quick service

Who is this for: RV owners and fleet managers who want a tidy, single-hose solution for dumping both black and grey tanks. It’s a practical choice for caravans, motorhomes and service fleets that require a durable, serviceable valve assembly built from impact-resistant ABS and engineered for straightforward maintenance and reliable operation.