A bare ~23 mm head in a 4" lateral rides low like a submarine with a bent periscope. Guide skids and rollers are the cheap optics upgrade nobody markets as hard as “1080P”—yet they decide whether your footage shows the crown crack or a perpetual chin-down smear of grit.
This page goes deeper than a general accessories list. Broad add-on map: sewer camera accessories. Camera class first: homeowner kits · plumber kits.
Skid vs roller: what each is for
| Type | Best for | Tradeoffs |
|---|---|---|
| Fixed ring / star / cage skid | Centering in 3–6" residential laterals; lens lift | Wrong OD jams; fingers snag on offsets and tuberculation |
| Roller / wheel guide | Longer pushes; reducing drag on grit | Wheels crack; axles collect hair/grease; more parts to fail |
| Spring / flexible guides | Slight give through imperfect joints | Can wrap or deform; inspect after every hard hit |
| Dual-size sets | Mixed 3" and 4–6" routes | Label them or you will grab wrong mid-job |
Sizing math that prevents jams
- Measure camera head OD (often ~17 mm or ~23 mm class)—see 17mm vs 23mm.
- Read the skid’s intended pipe ID range. A “4–6 inch” cage in a 2" branch is a stuck story.
- Remember fittings are tighter than straight pipe. Ovalized PVC and heavy scale shrink clearance.
- If you run both tight branches and big laterals, keep two heads or two skid sizes—do not force one setup.
When to run the head bare
- Known tight 2" lines and small-head kits.
- First exploratory push where unknown reducers may lurk—then re-push with a skid once diameter is proven.
- Severely offset joints that catch every finger of a cage (sometimes a different skid style helps; sometimes you hire).
- When the “guide” is undocumented junk with no OD printed.
Materials and failure points
| Part | Watch for |
|---|---|
| Plastic fingers / rings | Cracks, missing tips, embedded grit |
| Set screws / collars | Loosening mid-pipe—check before every push |
| Roller axles | Hair mats, seized wheels |
| Metal cages | Burrs that scratch windows or soft PVC |
A cracked skid that flaps becomes a snag. Inspect during wipe-down with the rest of your hygiene kit.
Push technique with guides installed
- Seat the skid fully; tug-test before the cleanout.
- Feed steadily—guides reduce dive but do not license forcing a hard stop.
- If the image spins less usefully, remember self-leveling (when present) still matters: self-leveling guide.
- On retrieval, do not rip a caught cage; reverse, twist gently, reassess.
Full workflow: how to use a drain camera. Defect reading once the view is centered: how to read an inspection.
What to buy first (after the camera)
- One fixed skid matched to your primary pipe size and head OD.
- Spare fasteners for that skid.
- Rollers only if you already feel drag on long 4"+ pushes.
- Never before fixing wrong cable length or endoscope-class mistakes—sewer vs endoscope · cable length.
Locator is a separate decision from skids: 512Hz locators · locator kits.
Frequently asked questions
What do sewer camera guide skids do?
They center and lift the camera head in larger pipe so the lens is not dragging on the invert. That improves image orientation, reduces window abrasion, and stabilizes the push through joints—when the skid OD matches the pipe.
Do I need roller guides or fixed skids?
Fixed ring/cage skids are the common residential upgrade for 4–6" laterals. Roller/wheel guides help on longer pushes by cutting drag, but wheels crack and pack with hair—inspect every job. Many homeowners start with one correctly sized fixed skid.
Can guide skids jam in 2-inch pipe?
Yes—especially skids meant for 4–6" lines. For dedicated 2" work, use a small head and skip oversized guides. Head sizing: 17mm vs 23mm guide.
Are universal sewer camera skids truly universal?
Only if the published head OD and pipe range match your kit. “Universal” without millimeters is a return waiting to happen.