T1035 — 90° elbow with bayonet outlet
A 90° discharge elbow for one matching 3-inch waste-valve flange. Its bayonet-lug end accepts a compatible sewer-hose coupling or outlet cap.
View T1035Valterra RV Waste Outlet Elbows, Wyes & Rotating Flange Parts
Replacing the elbow or collector fitting behind an RV waste valve takes more than identifying a 3-inch drain. These Valterra fittings differ in the number and size of valve flanges and whether the opposite end has a bayonet outlet, pipe hub or spigot. A part with the wrong connection can require changes to the drain system instead of simply fitting the existing assembly.
Valterra waste-pipe fitting comparison
| Valterra part | Exact connection layout |
|---|---|
| T1035 | 3-inch bayonet × 3-inch rotating flange |
| T1035-1 | 3-inch hub × 3-inch rotating flange |
| T1036 | 3-inch bayonet × 3-inch rotating flange × 1½-inch rotating flange |
| T1036-1 | 3-inch spigot × 3-inch rotating flange × 1½-inch rotating flange |
| T1039 | 3-inch bayonet × two 3-inch rotating flanges |
| T1015-1 | 3-inch bayonet × 3-inch rotating flange × 2-inch hub |
Identify each connection end
Rotating flange
A bolted valve connection whose flange can be aligned with the matching valve's mounting holes before assembly.
Bayonet outlet
A waste-discharge outlet with lugs for a matching sewer-hose coupling or outlet cap.
Hub
A socket-style pipe end designed to receive a matching spigot or pipe end.
Spigot
A smooth male pipe end intended to enter a compatible hub connection.
A 3-inch bayonet is not a substitute for a 3-inch hub. Likewise, the 1½-inch flange on T1036 is not a 2-inch hub like the branch of T1015-1. Always check the original connection types and the relative direction of the fittings.
Match the number of valve connections
One flanged waste valve, 90° outlet
One 3-inch valve flange → 90° elbow → either a 3-inch bayonet outlet (T1035) or a 3-inch pipe hub (T1035-1). Choose by what connects to the other end.
Two flanged waste valves, different sizes
One 3-inch flange plus one 1½-inch flange → two-way elbow → either a 3-inch bayonet outlet (T1036) or a 3-inch spigot end (T1036-1). Check the two flange locations as well as the end connection.
Two 3-inch flanges or a 2-inch pipe branch
T1039 uses two 3-inch rotating flanges leading to a 3-inch bayonet. T1015-1 uses one 3-inch rotating flange and a separate 2-inch pipe hub, with a 3-inch bayonet outlet. They are not alternative names for the same assembly.
Compare replacement fittings and photos
T1035-1 — 90° elbow with hub
Similar 90° direction change, but its other end is a 3-inch pipe hub rather than a bayonet sewer-hose outlet. Match it to the pipe joining method on your RV.
View T1035-1T1036 — Two-way elbow with mixed-size valve flanges
Combines a matching 3-inch and 1½-inch flanged waste-valve connection into a 3-inch bayonet outlet. Both flange sizes and their placement must match the installed valves.
View T1036T1036-1 — Two-way elbow with pipe spigot
A mixed-size two-valve elbow like T1036, but with a 3-inch spigot end for a matching pipe socket rather than a bayonet hose connection.
View T1036-1T1039 — Two-way elbow with two 3-inch valve flanges
Joins two compatible 3-inch flanged waste outlets to one 3-inch bayonet sewer connection. It is not the mixed 3-inch/1½-inch version.
View T1039T1015-1 — Reducing wye with 2-inch hub
A reducing wye that joins a compatible 3-inch flanged valve connection and 2-inch hub pipe connection into one 3-inch bayonet outlet. Check the angled branch and pipe alignment.
View T1015-1Before replacing a waste outlet elbow or wye
- Find the original part number on the existing fitting where visible. Compare it with the exact Valterra MPN, not just the general elbow shape.
- Count the inlets and measure their nominal sizes. Record whether there is one flanged connection, two flanges, or a flanged connection plus a separate hub branch.
- Identify the discharge end. Check whether the RV uses a bayonet coupling directly at the fitting or needs a hub or spigot to join fixed plumbing.
- Compare the physical orientation. Check the elbow direction, branch clearance, bolt-hole alignment, and space for the gate valves and handle travel.
- Plan the repair safely. Empty and flush the affected tanks, support connected plumbing, use the correct valve seals and hardware, and follow the instructions for the joint and pipe material. A solvent-weld pipe connection is not the same as a removable bolted flange.
More RV waste-system references
If you need the valve body rather than its connecting elbow, our Valterra Bladex replacement bodies guide covers the common sizes and handles. For the hose-side bayonet connection and dump-station elbows, see our Valterra sewer adapter reference. Valterra's factory flanged-fitting catalogue provides component identification for these fitting families.
Compare outlet fittings with the holding-tank discharge layout
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