BT Chassis Flushing Kit
The Big Truck Chassis Flusher. Perfect for any vehicle with holes in the frame. Our chassis flusher connects to your standard garden hose. Fill the inline soap dispenser, turn on the water, and wat...
- Magnetic snap-on mount
- Built-in soap reservoir
- Flushes inside frame rails
- Fits any 3/4" garden hose
The damage
you can't see.
Frame rails on your truck or Jeep are hollow. Every time you drive through salt, slush, mud, or beach sand, that grit gets pushed inside through the drain holes — and stays there. Your car wash hits the bottom of your frame. It does not get inside it.
Why frames rot from the inside
Body-on-frame vehicles — F-150, Silverado, Ram, Tacoma, Wrangler, 4Runner, Bronco, Gladiator — all share the same vulnerability. The frame is a hollow C-channel or boxed steel rail, drilled with weep holes for the wiring and fluids that run through it.
Those same holes are an open invitation for salt brine, road grit, and mud to get pulled inside the frame. Once it's in, it sits against bare metal and starts converting steel into rust. By the time it shows on the outside, you're usually two years and a few thousand dollars deep.
A 5-minute flush after a salty drive or off-road run washes that material out before it has the chance to bond. That's the entire job of this kit.
Four steps.
Five minutes.
No drilling, no permanent mounts, no tools. Snap it on, fill the soap, hook the hose, walk away from rust.
Snap it on
Magnetic mount locks onto your frame rails in seconds. No drilling, no permanent hardware, comes off just as fast.
Fill the soap
Built-in reservoir holds your degreaser or wash soap. Soap mixes with the water as it sprays so it actually breaks grime down.
Hook the hose
Connects to any 3/4" garden hose. Works on standard household pressure — no power washer required.
Walk away
Multi-directional jets blast inside the frame rails. Five minutes, one beer, and your chassis is flushed.
What's in
the box.
Tap the markers to see the magnetic mount and the soap dispenser in motion.
Box to spray
in under 2 minutes.
Watch Trey put the whole thing together. No tools, no manual, no struggle — just a hose and a goal.
BT Flusher
vs. car wash.
Automatic car washes spray the bottom of your frame. They don't get inside it. Here's the difference, line by line.
| BT Chassis Flusher$37.50 | Drive-thru car wash | |
|---|---|---|
| Reaches inside frame rails | Yes | No |
| Removes trapped salt & brine | Yes | No |
| Uses soap or degreaser | Yes — your choice | No |
| Flushes hidden cavities | Yes | No |
| Works on F-150, Silverado, Ram, Tacoma, Wrangler, 4Runner, Bronco | Yes | N/A |
| Cost over 5 years | $37.50 once | $15 × ~50 washes = $750+ |
Reviews from
actual rigs.
We don't pay for reviews and we don't filter the bad ones. Here's what people in the salt belt have said after running this kit through a real winter.
Run it after every Moab trip and every winter drive. Five minutes in the driveway, flush the frame, done. Beats spending an afternoon under the Jeep with a wand.
Bought this after watching how much salt our county throws on the roads. The water that comes out of the frame the first time is brown. That's not on the underside — that's coming from inside the rails.
Lake-effect winters destroyed my last truck's frame. Not doing that twice. This took me 2 minutes to figure out and works on any of my trucks. Cheap insurance.
Real questions,
straight answers.
If your question isn't here, email us — a real person at BT will get back to you the same day.
Why do I need this if I already wash my truck?
A car wash sprays the underside of your frame. The frame is hollow. Salt, brine, and mud sit inside the rails, against bare metal, where no spray reaches. The Flusher is the only thing that gets in there short of a lift, a wand, and an afternoon you don't have.
Will it work with my hose?
Yes. Connects to any standard 3/4" garden hose, no adapters required. Standard household water pressure (40–60 PSI) is enough — you do not need a pressure washer.
How long does it actually take?
Out-of-box to first spray is under 2 minutes — there's a video of Trey doing it above. The flush itself is about 5 minutes per truck. Total time, less than 10 minutes.
What vehicles is it compatible with?
Any body-on-frame vehicle with steel frame rails. That includes most full-size trucks (F-150/250, Silverado/2500, Ram, Tundra, Titan), mid-size trucks (Tacoma, Ranger, Colorado), Jeeps (Wrangler, Gladiator), and body-on-frame SUVs (4Runner, Bronco, Sequoia, Tahoe, Suburban). If you're not sure, email us your year/make/model.
How often should I run it?
After every winter drive on salted roads, after off-road trips, and after any time your truck sees standing salt water or beach sand. In the salt belt, plan on once a week from December through March. The rest of the year, after dirty drives.
What if I don't love it?
30-day returns, no questions, no restocking fee. We'd rather have the kit back than have you sitting on something you don't use.
Stop paying
for rust you
can't see.
Five minutes in your driveway. One garden hose. The cheapest insurance policy your truck will ever have.
- Ships from Utah, 1–2 business days
- 30-day returns, no questions
- Real human support, real fast
Snap. Spray. Done.
Magnetic mount locks onto your frame rails in seconds. No drilling, no permanent hardware, no tools — just a strong hold that doesn't move once water pressure hits it.
Multi-directional jets pull water through the soap mixer and push it where car washes can't reach: inside the rails, into the cavities, where the rust actually starts.
Add the soap. Hit the grime.
The built-in reservoir takes whatever you'd run through a power washer — degreaser for off-road grime, foam soap for winter brine, or plain water for a quick rinse.
Soap mixes with the spray as it leaves the head, so the cleaner reaches where it needs to. No pre-treating, no second pass, no scrubbing.