RIDGID K9-204+ FlexShaft Machine (Model 76198)

Description

The RIDGID K9-204+ FlexShaft Machine (Model 76198) clears 2″ to 4″ pipe with a fully enclosed FlexShaft system, chain knockers that scrub the full pipe wall, and a camera-ready design that lets you inspect while you clean. It replaces the drum-style sewer machine on jobs where mess, setup time, or verification matter most.

Some contractors search for this machine as the RIDGID K9-204, without the plus sign. The “+” marks the current generation of the K9-204 line, and it’s what RIDGID currently ships under model 76198.

What the K9-204+ Cleans

Spec	Detail
Pipe capacity	2″ – 4″ (50 – 100 mm)
Cable length	70′ (21.3 m)
Cable diameter	5/16″ (8 mm)
Sheath material	Durable nylon
Power source	Electric, runs on a RIDGID FlexShaft power drive
System type	Fully enclosed FlexShaft system
Chain knockers	Compatible with standard and carbide-tipped RIDGID chain knockers

K9-204+ vs. K9-306: Picking the Right Size

The K9-204+ covers 2″ to 4″ pipe, the range most common in commercial kitchens, multi-family stacks, and institutional lateral lines. If your crew regularly hits larger diameter lines, 4″ and up, the RIDGID K9-306 FlexShaft Machine extends that range and runs the same chain-knocker and camera-ready system. Many facilities and commercial service crews carry both, since a single machine rarely covers every pipe size on a mixed-use property.

Chain Knockers That Clean the Full Wall

The chain knockers expand to match the pipe’s inner diameter as they spin, scrubbing grease, roots, and buildup from edge to edge instead of just punching a hole through the center of the clog. That matters most on grease-heavy commercial lines, where a cable alone often clears a path but leaves the walls coated and ready to clog again within weeks.

Standard chain knockers handle routine grease and soft buildup. For root intrusion or hardened scale, the K9-204+ also runs carbide-tipped chain knockers, which hold an edge longer against harder material without needing to switch to a different machine.

Because the FlexShaft system supports camera use at the same time, you can watch the pipe wall get scrubbed clean in real time instead of pulling the cable and running a separate inspection pass afterward.

Built for Fewer Callbacks, Not Just Faster Setup

The enclosed drum keeps grease and debris contained instead of splattering across the work area, which matters on a job inside a restaurant kitchen or an occupied building. Perimeter latches give quick access to the drum for maintenance or a cable swap without tools. The cable clamp is reinforced on the “+” generation specifically because that’s where earlier models tended to wear first under repeated heavy use.

An on-board hex key mount keeps the one tool you need for adjustments attached to the machine instead of loose in a truck bin, a small detail that matters when you’re mid-job and need to make a quick tension adjustment.

Where This Machine Gets Used

• Commercial kitchens, clearing grease buildup in floor drains and lateral lines with camera verification
• Multi-family and apartment buildings, restoring clogged stacks and common lines with minimal disruption to tenants
• Hospitals, schools, and other institutions, maintaining sanitary lines without chemical treatments
• Scheduled preventive maintenance programs, run on a cycle to head off grease, sludge, or root problems before they cause a backup

Frequently Asked Questions

What pipe sizes does the K9-204+ handle?

2″ to 4″ (50 to 100 mm), the range most common in commercial and multi-family drain lines.

Can I run a camera while the machine is cleaning?

Yes. The FlexShaft system supports simultaneous camera use, so you can inspect the pipe while the chain knockers are still working instead of running a separate pass.

What changed with the “+” version?

Latching perimeter doors for faster drum access, a reinforced cable clamp for longer cable life, and on-board hex key storage. These updates target the wear points professional crews hit most on earlier K9-204 models.

Is this the same machine as the RIDGID K9-204?

Yes. K9-204+ is the current generation of the K9-204 line under model 76198. Both names refer to the same machine.

What’s the difference between standard and carbide-tipped chain knockers?

Standard knockers handle routine grease and soft buildup. Carbide-tipped knockers hold an edge longer against roots and hardened scale, useful when the same machine needs to handle tougher clogs without a tool change.

Pair the K9-204+ with a RIDGID K9-306 FlexShaft Machine if your crew also runs larger-diameter lines, or browse RIDGID Drain Cleaning Equipment for the full lineup. Download the RIDGID K9-204+ Operator’s Manual for full setup and maintenance instructions. Order from J.M. McKinney Co. for genuine RIDGID equipment, in-stock availability, and fast shipping.