Ustinian RV and Camper Sewer Waste Plumbing Connection System Kit with Slip Fit Coupling Adapter, for 3inch PVC Pipe RV Sewer Hose Fittings RV Sewer Adapter

Why I reached for this kit

After more seasons than I care to admit wrestling floppy hoses and improvised reducers, I wanted a tidy, hard-piped sewer run at a long-term campsite—something I could assemble quickly, trust to stay leak-free, and break down without a fight when it’s time to move. The Ustinian sewer connection kit promised exactly that: a focused set of 3-inch-compatible adapters and fittings, a slip-fit approach aimed at repeat use, and a storage box to keep the chaos in check. I used it to convert a flexible hose setup into a semi-permanent 3-inch PVC run and lived with it for several weeks. Here’s how it fared.

What’s in the box and how it’s built

The kit includes the right basics for building a short, direct run:
- Gate valve bushing and 4" x 3" gate valve adapter
- 90-degree elbow
- 3" x 3" coupling
- 3‑in‑1 slip-fit cleanout adapter
- Pipe cap
- Plastic storage box

Everything is PVC and finished cleanly, with smooth sockets and consistent wall thickness. The slip-fit parts have snug tolerances; they were tight enough to inspire confidence but not so tight that I needed a dead blow mallet to seat them. The storage box is a nice touch—rigid enough to protect the pieces, sized sensibly (roughly 18 x 12 inches), and not a flimsy afterthought. If you keep your plumbing kit in an exterior bay, having all the bits contained and not rattling around with leveling blocks is a quality-of-life upgrade.

Setup and installation

I installed the kit on a stationary trailer where the park’s sewer connection sat about 12 feet from the RV termination. You’ll still need to buy your own straight lengths of 3-inch pipe; the kit is all adapters and fittings. I measured and cut Schedule 40 PVC, did a dry fit, then assembled the run with the supplied coupling and elbow.

A few practical notes from the install:
- The slip-fit approach is friendly. I dry-fit first, then decided where I wanted permanence. On the “fixed” side of the run (near the park cleanout), I solvent-welded for a set-and-forget joint. Closer to the RV, I left the coupling and the cleanout adapter slip-fit for serviceability. If you expect to move periodically, this hybrid strategy works well.
- The 3‑in‑1 cleanout adapter covered the common municipal connections I encounter. It seated square and sealed up without fuss.
- The gate valve adapters are useful if you’re marrying into a valve housing rather than a bayonet termination. If your RV ends in the standard bayonet fitting, you’ll still want a bayonet-to-PVC adapter—plan on adding that to your cart.

All told, I went from box opening to functional, hard-piped system in under an hour, including cutting pipe. That’s about as painless as RV waste plumbing gets.

Leak resistance and day-to-day performance

I ran the system through the usual routine: grey water trickle, periodic black tank dumps, and a few intentional stress tests—filling a section with a hose to check for weeping at joints. The slip-fit joints I left unglued stayed dry. Flow was smooth, and the 90-degree elbow didn’t become a catch point for solids; the internal bore is clean and the bend is true, which matters more than you’d think.

At the park connection, the cleanout adapter sealed as well as a solvented adapter would have. I gave it a quarter-turn tighten by hand after the first day (PVC will relax slightly after initial assembly), and it remained tight through a hot-cold cycle and a couple of storms.

A note on temperature: PVC stiffens in colder conditions. In my tests around 40–50°F, slip-fit joints were still serviceable, just a bit less forgiving on disassembly. A tiny dab of silicone-safe plumber’s lubricant on mating surfaces makes breakdown much easier without compromising the seal.

Compatibility realities

This kit is tuned for 3-inch PVC systems. That covers many stationary or semi-permanent setups, but there are three caveats worth calling out:

1) Bayonet terminations: If your RV ends in a four-lug bayonet (many do), you’ll likely need a bayonet-to-3-inch PVC adapter not included here. Once you have that, the rest of the kit integrates smoothly.

2) ABS vs. PVC: A lot of OEM RV drain plumbing is ABS. This kit is PVC. If you’re transitioning between them, use a rubber transition coupling or a proper transition cement rated for ABS-to-PVC. Don’t mix standard PVC cement with ABS and hope for the best.

3) Geometry: You get one 90-degree elbow in the box. If your run requires multiple turns or a gentler sweep for better flow, plan to add 45s or long-sweep elbows. The included parts cover a straightforward line; more complex layouts will need a couple extra fittings.

None of these are deal breakers, but they’re worth planning for to avoid a second hardware run.

Usability and serviceability

What I appreciated most is the balance between “set it and forget it” and “take it apart without swearing.” The slip-fit coupling is tight, and on my system it didn’t seep under grey water trickle or during a full black dump. For a truly permanent install, solvent-welding those joints is still the gold standard. But the kit’s slip-fit tolerance is good enough that I trusted it near the RV end, where I want access for maintenance.

The pipe cap is a simple part that earns its keep. For winterization and transport, capping the line prevents drips and odors. It also kept spiders out of the cleanout during a weekend away—small thing, big appreciation when you’re reassembling.

Durability and storage

PVC can take a beating if it’s schedule-rated and assembled properly. The sockets and hubs in this kit are clean and didn’t show flashing or thin spots. After several assemblies and disassemblies, I didn’t see ovalization or wear on the sockets, which bodes well for repeated use. I kept the unused fittings in the included box, which survived a few bumps in the storage bay without cracking a hinge or latching open. If you routinely break down your setup, having a dedicated case is the difference between starting a setup and starting a scavenger hunt.

What I’d improve

• Include a second 90 or a pair of 45-degree elbows. Many sites require a jog or two, and the additional fittings would eliminate a hardware run.
• Offer an optional bundle with a bayonet-to-PVC adapter. It’s the most common missing link for RVers converting from hose to pipe.
• Mark the sockets with depth guides. It’s a small manufacturing step that makes consistent assembly faster, especially for beginners.

Who it’s for

• Seasonal or long-term campers who want a clean, stable, low-maintenance sewer connection.
• DIYers comfortable cutting and dry-fitting 3-inch pipe.
• Anyone tired of chasing pinhole leaks in flexible hoses and willing to assemble a semi-permanent run.

Who should skip it:
- Travelers moving every few days. A lightweight hose with quick couplers is faster for truly transient camping.
- Users expecting a plug-and-play solution without buying any additional pipe or possibly a bayonet adapter.

The bottom line

The Ustinian sewer connection kit does the important things right: solid PVC components, snug slip-fit joints that can be trusted for repeated assembly, and a sensible assortment of adapters to bridge from your RV side to the park cleanout. It won’t replace every fitting you might need for complex runs, and it doesn’t include straight pipe, but as the backbone of a tidy 3-inch system, it’s dependable and easy to live with.

Recommendation: I recommend this kit for anyone setting up a stationary or seasonal RV sewer connection who wants the reliability of hard pipe without committing every joint to solvent. It’s well made, thoughtfully packaged, and provides a clean path from RV to ground without the usual drama. Just budget for a bayonet-to-PVC adapter if your rig needs one, pick up a couple extra elbows to match your site geometry, and you’ll have a durable, low-leak system that’s easy to service.