SMZTools 70424 RV Macerator Hose Sewer Kit for Thetford Sani-Con 62-5800 15/12,62-5800 35/45,22FT Camper Sewage Pump Hose/Waste Water Hose with Connect Fitting,4 tightening hoops, Black

Why I switched and what I found

Sewer gear isn’t the glamorous side of RV life, but the wrong hose will make every dump a headache. I needed a compact, durable replacement discharge line for a macerator-equipped rig, and the SMZTools 70424 hose caught my eye as a 22-foot, 1-inch solution that promised flexibility and a small storage footprint. After several weeks of use across a handful of dump stations, I’ve got a clear sense of where it performs and where it falls short.

What’s in the box and first impressions

The kit is simple and focused: a black, corrugated 1-inch ID hose that extends up to a claimed 22 feet, a straight coupler, and four worm-gear clamps. The hose material feels better than the flimsy vinyl you see in bargain options—firmer walls with a pliable coil, good rebound, and no plasticky smell out of the bag. The black color is a small but welcome choice; it hides scuffs and staining and tends to stand up better to UV than lighter hues.

A quick note on diameter: at 1 inch, this is not a traditional 3-inch gravity sewer hose. It’s sized for macerator discharge lines. If your RV relies on a 3-inch bayonet connection and gravity flow, this isn’t the right format. If you have a Thetford Sani-Con or similar macerator system with a 1-inch barb, the size is right in the pocket.

Compatibility: read this before you buy

In practice, the SMZTools 70424 hose behaves like a replacement or extension hose for macerator-equipped systems. I used it on a Thetford Sani-Con setup with a 1-inch barb outlet, and the fit with the included coupler and clamps was straightforward. There are no bayonet adapters or threaded dump fittings in the kit; you’re expected to clamp it directly to a barb on your system and attach the other end to the dump station nozzle you already have.

The product page language can be confusing, but here’s the bottom line from my experience:
- If your RV has a macerator with a 1-inch discharge barb, you’re in business.
- If you have a standard 3-inch gravity system, look elsewhere; you’ll need a 3-inch hose with bayonet fittings.

Setup and installation

Fitting the hose was a 10-minute job:
1. Dry-fit the hose to the macerator’s 1-inch barb to confirm length and orientation.
2. Slide a clamp onto the hose, push the hose fully over the barb, and tighten the clamp until snug. Don’t overtighten—worm-gear clamps can bite into the hose if you get aggressive.
3. Use the supplied coupler and additional clamps if you’re joining segments or need a mid-run connection.
4. Pressurize briefly (with grey water) to check for weeps before moving to black tank discharge.

The included clamps are serviceable. If you camp near the coast or plan long-term use, consider upgrading to 316 stainless clamps for better corrosion resistance.

Performance at the dump station

Flow and backpressure: With a macerator doing the heavy lifting, a 1-inch discharge line is sufficient for steady flow. The hose didn’t kink under typical bends around the pedestal and curb, and it held its shape when partially elevated to maintain slope. Interior smoothness is decent for a corrugated hose; I didn’t see any stuttering or “peristaltic” pulsing that can happen with overly soft lines.

Length, realistically: The “22-foot” spec is achievable only under noticeable stretch. Relaxed and routed with gentle curves (the way you’ll actually use it), I found the practical reach closer to the high teens. If you regularly need a true 20–22 feet without tension, plan for a closer approach to the drain or use an extension segment. I’d budget this as an 18–20-foot working hose and treat 22 feet as the emergency max.

Flexibility and cold weather behavior: On a cool morning in the 40s F, the hose stayed pliable enough to route without wrestling. It regains its coil quickly, and the memory isn’t so aggressive that it fights you around corners. In summer heat, it didn’t soften to the point of flattening under its own weight.

Leak resistance: With clamps correctly positioned over barbs, I experienced no drips. The hose wall has enough substance that the clamp bites evenly without cutting. As with any discharge line, retighten after the first couple of uses as plastics settle.

Drain-down, cleanup, and storage

A small-diameter hose has a big advantage in cleanup: it drains fast and doesn’t hold much residual liquid. I lift the run from RV end to nozzle end before shutting off the macerator and give it a quick backflush with grey water. The black color hides the inevitable scuffs, and the hose coils into a compact loop that fits easily in a wet bay bin. If you store in a high-UV compartment, toss in a shade sleeve or keep it out of direct sun when possible—UV protection is good, but no plastic wins a prolonged sun bake-off.

Durability and build quality

So far, the material holds up well to clamping pressure and routine flexing. No white stress marks at tight bends, and no delamination where the coils meet. The coupler appears to be a hard plastic (likely polypropylene or nylon); threads and barbs are cleanly formed. It’s fine for most users, though I’d keep a spare coupler in the rig if you’re traveling long-term, just as you would with any mission-critical plumbing piece.

Friction points and limitations

• Nominal length vs. working length: You can reach 22 feet if you pull it taut, but that’s not how you should run a discharge hose. Plan for less and you’ll be happier.
• Marketing clarity: The 1-inch size makes this a macerator hose; it’s not meant for 3-inch gravity systems. If you’re new to RV plumbing, that distinction can be easy to miss.
• Basic clamps: They work, but they’re not premium. Upgrading to higher-grade stainless is inexpensive insurance.
• No dump-end hardware: You’ll need your existing nozzle/adapter for the dump station connection.

Who it’s for

• Owners of macerator-equipped rigs (Thetford Sani-Con and similar) needing a compact, flexible replacement or extension hose.
• Van campers and small Class B owners who prize storage efficiency.
• Travelers who frequently encounter awkward dump station layouts and need extra reach in a smaller-diameter format.

Who should skip it:
- Anyone with a standard 3-inch gravity sewer setup. Get a 3-inch bayonet hose with the right fittings and valves.
- Users who truly need a consistent, no-tension 22-foot reach for every dump station; consider a longer hose or a secondary extension.

Tips for best results

• Don’t over-stretch. Treat 22 feet as a ceiling, not a target.
• Support the hose with a gentle slope during discharge, then lift from the RV end to empty the last bit of water.
• After a few uses, retighten clamps and inspect the first inch behind each clamp for compression marks.
• Rinse after every dump and periodically backflush with a dedicated grey-water cycle to keep odors down and flow free.

The bottom line

The SMZTools 70424 hose does the fundamentals right for macerator systems: it’s compact, flexible, and tougher than bargain-bin options, with clean clamping surfaces and no-fuss storage. In day-to-day use, it delivers a steady, reliable discharge without kinks or leaks, and cleanup is quick. The length claim is optimistic unless you’re willing to put the line under tension, and the kit’s hardware is basic—but both are manageable with realistic expectations and a couple of inexpensive upgrades.

Recommendation: I recommend this hose for RVers with macerator-equipped systems who want a durable, compact replacement or extension with a small storage footprint. It’s not the answer for 3-inch gravity setups or for those who truly need a guaranteed 22-foot run, but within its intended use, it’s a solid, dependable performer.