An inaccessible cleanout does not automatically rule out jetting, but the plumber must establish a suitable drain opening, hose route and equipment setup. RIDGID's KJ-2200/3100 instructions allow fixture removal for access and prohibit feeding its hose through an installed fixture. Camera access alone does not establish jetter access. Adding a permanent cleanout may be the better choice.
Establish the actual drain opening
A missing, buried or inaccessible cleanout changes the access plan. It does not establish that every other opening is suitable for high-pressure cleaning. Ask the plumber to identify the intended entry, which part of the line can be reached and what must be removed and restored.
RIDGID's KJ-2200/3100 operator manual says to remove a fixture, such as a water closet, if necessary for drain access. It also says not to feed the hose through a fixture because that can damage both the fixture and hose. This is an equipment instruction for those models, not permission to jet through an installed toilet bowl.
Camera inspection without a cleanout has its own access choices. A camera that fits through an opening does not prove that a jetter hose and nozzle can use the same route safely.
Match the machine, hose and pipe
The KJ-1350/1750 manual distinguishes hose and nozzle choices for different drain sizes and applications. Its KJ-1350 product specification lists sludge, soap and grease blockages within its specified drain-size range. Another jetter's advertised pressure does not establish its suitability for this opening or pipe.
Have the provider assess the line's material, observed condition, bends, blockage and available water supply. Hose passage is only one consideration. Jetting old cast iron or clay explains why visible inspection cannot guarantee remaining pipe strength or harmless cleaning.
Require a controlled work area
The KJ-2200/3100 instructions address guiding the hose between the opening and operating point to control whipping and prevent damage. They also warn that the pressurized nozzle must stay contained in the drain. These are operator responsibilities, not a homeowner procedure for pushing a rental hose into an unfamiliar opening.
Those gasoline-powered models must operate outdoors because their engines produce carbon monoxide. An open garage door or window does not satisfy the manual's outside-only instruction. Electrical models have separate power and shock precautions; do not transfer one machine's setup to another.
Compare alternate access with adding a cleanout
Ask whether exposing an existing cleanout, removing and restoring a fixture, or installing a permanent access point is the appropriate plan. Cleanout requirements depend on the adopted code and installation. Keep the entry accessible and correctly closed afterward rather than treating temporary access as a permanent repair.
Do not open a cleanout yourself when the line is backed up; sewage can escape. For the cleaning decision, jetting versus snaking remains a separate question. Confirm the access, permitted equipment, inspected extent and restoration before approving the work.