The Valterra Slip Socket Flange 3" ID is the bit of gear you bolt on when you need a straight 3 inch run for black water pipe on the van. The base sits at 110 mm x 110 mm, so it lines up neatly on most flat tank faces or floor plates. The 89 mm inner diameter keeps flow close to a true 3 inch path from the tank to the rest of the plumbing.

The plastic body runs a 100 mm outer diameter at the socket, so there is enough wall thickness for weekend after weekend of use. The flange suits a separate 3 inch seal, letting you swap in a fresh seal when the old one wears out. The black finish helps the kit blend in under the van and hides most grime, which is handy once the kilometres and dust start to build up.

• Valterra slip socket flange with 3" inside diameter
• Suits separate 3 inch seal (seal not included)
• 89mm inner diameter for standard 3 inch pipe
• 100mm outer diameter for added wall thickness
• 110mm x 110mm square mounting base
• Plastic construction suited to caravan black water plumbing
• Black colour to match common RV pipework
• Square base layout helps alignment on flat tank surfaces
• Classified as a hose fitting for black water systems
• Suitable for use in caravan and RV plumbing setups

Q: Does this flange include the 3 inch seal?

No, the 3 inch seal is not included. You will need to purchase a separate 3 inch seal to match this flange. This keeps the kit flexible if you already carry spare seals. It also lets you choose a seal style that matches the rest of your plumbing. Always check the seal size before heading off on a longer trip.

Q: What type of pipe does the 3 inch ID suit?

It suits pipe sized to a 3 inch internal diameter. The inner diameter is listed as 89 mm, which matches standard 3 inch black water pipe used on many caravans and RVs. That slip fit helps keep joints consistent across tanks, valves and elbows. If your existing fittings are 3 inch, this flange is intended to sit in the same run.

Q: Can I bolt this flange to a flat tank outlet?

Yes, it is made for flat mounting surfaces. The 110 mm x 110 mm base gives a square footprint that sits flat on tank faces and mounting plates. The flange has corner areas suitable for fixing with appropriate hardware. Just make sure the tank or plate surface is clean and flat before tightening everything down.

Q: Is the plastic suitable for outdoor and underbody use?

Yes, the plastic body is suitable for typical under-van locations. The material does not rust like metal, which suits the damp and dirty spots around waste tanks. The black colour hides road grime and dust that builds up on longer drives. Regular checks of seals and joints are still important, but the flange itself is made to handle everyday touring use.