lasuroa 4pcs 3/4 Inch Cable Grommets for Starlink, Anti-Slip Cable Routing Kit Split Wall Hole Pass Through Bushing Grommet for Ethernet/TV Wires Waterproof Cord Protection Accessories Part

Why I reached for these grommets

I needed a clean, weather-conscious way to pass a network cable through an exterior wall without leaving a ragged hole or an open invitation to bugs. I’ve used generic rubber bushings before, but they’re either solid (which forces you to remove connectors) or so soft they wiggle out over time. The lasuroa 3/4-inch split cable grommets promised a better balance: split-open installation, a grippy exterior, and silicone construction that won’t crack after a season. After using the pack on a few runs—Ethernet, coax, and a subwoofer line—I’ve got a solid sense of where they excel and where a bit of planning helps.

Design and build

Each grommet is a flexible silicone piece meant for a 3/4-inch (about 19–20 mm) wall hole, with an inner channel that accepts cables up to 7 mm (0.28 in) in diameter. The outer surface is ribbed and lightly textured to stay put in drywall or wood. The face flange is clean, unobtrusive gray, and covers the hole neatly on finished walls. The split along one side is the key: you can open the grommet, seat it around an already-terminated cable, then press it into the hole. No fishing RJ45s or F-connectors through tight rubber openings.

Silicone is the right choice here. It’s softer than hard plastic bushings (which protects cable jackets from abrasion), but much more stable than cheap rubber. It resists cold, heat, and moisture exposure well. In my installs these have kept their shape and grip, and they don’t take a compression “set” the way lower-grade rubber often does.

Installation experience

• Hole size: The spec calls for a 3/4-inch (roughly 19 mm) opening. A sharp spade bit or step bit makes the job easy. In wood and drywall, I preferred a step bit so I could sneak up on the fit; in one case, a full 3/4-inch spade bit produced a slightly looser fit than I wanted. If you can drill 19 mm instead of 3/4 inch, the grommet ribs seat more snugly.
• Split design: This is the difference-maker. I routed cables with connectors already crimped and simply “wrapped” the grommet around the cable, then rotated the seam to the underside for a clean look. No pinched jackets, no swearing at tiny holes.
• Seating: In drywall the ribs bite well. In painted plywood, they also hold, though I added a thin bead of silicone sealant around the circumference outdoors for long-term insurance. For masonry, you’ll want to core drill cleanly and likely rely on a sealant to lock the grommet in place.

Once installed, the result is tidy: a cable passing through a gray, low-profile ring without ragged edges or gaps.

Fit and compatibility

The inner channel is sized for cables up to 7 mm. That covers most outdoor-rated Ethernet, coax, and many speaker/subwoofer lines. A few notes from my use:

• Standard Ethernet patch cables (often 5–6 mm) fit well. Thinner, ultra-slim patch cords can slide a bit in the inner opening. If you need a snug weather seal on a smaller cable, one wrap of self-fusing silicone tape or a short piece of adhesive-lined heat-shrink around the cable where it passes through the grommet solves it.
• Coax (RG6) and thicker outdoor Ethernet fit comfortably and seal nicely.
• Starlink and other specialty cables: The grommets are fine for the cable itself if it’s under 7 mm. The catch is the connector. Some dish systems use a bulky, non-cylindrical plug that requires a much larger hole to pass through. The split grommet lets you install without removing the plug, but if you needed to drill a hole bigger than the grommet’s face flange can cover, it won’t look right or seal well. Measure the plug’s maximum dimension and plan accordingly.

If you’re exiting a conduit, be aware: the outer ribs are designed to bite into wall material, not necessarily to lock into a smooth conduit mouth. In my tests, the grommet didn’t secure firmly inside Schedule 40 conduit ends. It works best in wood, drywall, siding cutouts, or a drilled hole in a junction box knockout with the right diameter.

Weather and pest resistance

These don’t turn a hole into a fully waterproof bulkhead on their own, but they’re a meaningful upgrade from a naked pass-through. The silicone body discourages drafts and insects, and the split seam can be rotated to shed water. For exterior penetrations, I treat them as part of a weather system: a bead of exterior-grade silicone around the flange and the inner cable channel creates a tight, long-lived seal. Do that, and rain and bugs stay out. Installed under eaves and sealant-backed, mine have held up in multiple storms without any sign of seepage.

Everyday benefits

• Safety and neatness: No sharp edges against cable jackets, no frayed drywall paper, and a much more professional look than a raw hole.
• Serviceability: Because the grommet is removable and split, adding or replacing a cable later is painless.
• Multi-run value: The four-pack is enough to finish both sides of two wall penetrations or outfit several single-sided runs in a rack room or office.

Where they could be better

• Hole tolerance: In some materials, a true 3/4-inch hole yields a fit that’s more “friction-held” than locked. If your bit runs a touch large or the material chips out, the grommet can feel a bit loose. Choosing a 19 mm bit or using a step bit to dial in the size fixes this, and a light silicone bead secures it outdoors.
• Small-cable sealing: The inner channel is optimized for ~6–7 mm cables. If you’re routing very thin leads, you’ll want a shim (silicone tape, heat-shrink) to seal tightly.
• Connector realities: The split design helps, but it can’t compensate for oversized connectors that force you to drill a hole larger than the grommet can cover. Measure your maximum required hole size and compare to the flange diameter before committing.

Practical tips from my installs

• Use a step bit for a perfect press-fit and less tear-out on drywall.
• On exterior walls, slope the hole slightly downward to the outside so any incidental moisture drains away from the interior.
• Backfill the perimeter with a thin bead of outdoor silicone before pressing the grommet in; wipe the face clean for a tidy finish.
• For extra cable strain relief, zip-tie the cable inside to a nearby stud or bracket so tension isn’t borne by the grommet.
• Rotate the split seam to the bottom or out of sight after seating.

The bottom line

The lasuroa split cable grommets do exactly what I want a pass-through to do: protect the cable, clean up the hole, and discourage the elements—all without forcing me to remove connectors or fight stiff rubber. The silicone body and ribbed exterior are thoughtfully executed, and installation is quick. They’re not a cure-all for oversized plugs or oversized holes, and very thin cables will need a small assist to seal tightly, but those are manageable realities with any universal grommet.

Recommendation: I recommend these if you want a simple, tidy, and durable way to route cables through 3/4-inch wall penetrations, especially for Ethernet, coax, and similar lines up to 7 mm in diameter. Measure your connector and hole requirements first, plan to add a bead of sealant for exterior runs, and you’ll get a clean, professional-looking result from a straightforward, well-made little accessory.