The right waste-valve assembly depends on how the RV plumbing connects to it. A hub receives a compatible pipe spigot, while a spigot fits into a matching female hub. A bayonet termination connects to an RV sewer hose cap or fitting. These are different connection arrangements even when the shutoff gate has the same 3-inch passage.
Compare the actual products
Each photograph is from the corresponding NewRVParts listing. Select a photo to view that product's full details.
T40 — 3-inch manual waste valve, hub to spigot3-inch female hub at one end, spigot at the other
T40B — 3-inch manual waste valve, hub to hub3-inch female socket connections at both ends
T40A — 3-inch manual waste valve, spigot to spigot3-inch male spigot ends on both sides
T50 — 3-inch waste valve with bayonet cap3-inch inlet hub and bayonet termination with cap
T58 — twist-on 3-inch waste outlet valveBayonet-attached add-on shutoff; no pipe joint cut required
T1001 — 1½-inch waste valve, hub to spigotSmaller 1½-inch manual waste valve assembly
T1002B — 2-inch waste valve, hub to hub2-inch manual waste valve with socket ends
Which inlet and outlet style is on your RV?
| Valterra part | Valve size | Inlet and outlet | What it replaces or adds |
|---|---|---|---|
| T40 | 3 inches | Hub × spigot | Permanent waste plumbing with unlike socket and male ends |
| T40B | 3 inches | Hub × hub | Permanent plumbing requiring two female socket connections |
| T40A | 3 inches | Spigot × spigot | Permanent plumbing requiring two male spigot connections |
| T50 | 3 inches | Hub × bayonet outlet with cap | Termination valve body with hose-ready bayonet fitting |
| T58 | 3 inches | Twist-on RV bayonet connection | Additional shutoff installed onto the existing termination outlet |
| T1001 | 1½ inches | Hub × spigot | Smaller waste-line valve, not a 3-inch assembly |
| T1002B | 2 inches | Hub × hub | 2-inch valve with female connections at both ends |
Understanding the complete plumbing path
The tank outlet or existing ABS pipe leads to the selected valve's inlet, through its sliding gate and on to a compatible pipe, elbow or sewer termination. If the outlet already has a standard bayonet, Valterra T58 can add a twist-on final shutoff without replacing the glued-in valve. T50 is different: it is a fixed 3-inch valve with a hub inlet and bayonet-cap outlet.