EPDM rubber slide-out bulb seal with rigid C-channel featuring a domed interior that provides clearance for slide-out cables. Slides onto a track channel or wiper seal with track to seal against the RV body when the slide-out is closed. Protects against harsh weather and pests while keeping cables safely housed within the channel dome. Hand crafted and made in USA.
The Steele Rubber Products 90-3392-265 is a 15/16" high by 1-1/8" wide EPDM rubber bulb seal with a rigid C-channel featuring a domed interior profile. Like other C-channel bulb seals, it slides onto a track channel or wiper seal with track — no adhesive required — and its primary function is to seal against the RV body when the slide-out is retracted and closed, blocking rain, wind, road debris, and pests from entering the gap between the slide-out and the coach wall.
The defining characteristic of the domed channel design is its purpose-built cable accommodation. Where a standard flat-bottom C-channel sits flush against the track, the domed interior arches upward inside the channel, creating a protected cavity that provides clearance for electrical cables and wiring routed along the slide-out frame. This prevents the channel from pinching, chafing, or compressing cables during slide-out retraction cycles — a critical distinction on slide-out systems where wiring runs beneath or alongside the bulb seal track. The 30 ft length covers two to three sides of a standard single slide-out and is a practical mid-range option between the single-side 15 ft strip and the full-perimeter 60 ft roll. Commonly found on Entegra, Forest River, Heartland, Keystone, and Tiffin RVs.
Slides onto a track channel or wiper seal with track — no adhesive or fasteners required; secure mechanical retention through the full slide-out extension and retraction cycle
Arched dome inside the channel creates a protected cavity that provides clearance for electrical cables and wiring routed along the slide-out frame — prevents pinching and chafing
EPDM bulb compresses against the RV body when the slide-out is closed, blocking rain, wind, road debris, insects, and rodents from entering the coach
Mid-range 30 ft strip covers two to three sides of a standard single slide-out. Hand crafted by Steele Rubber Products with 100% Satisfaction Guarantee
The 90-3392-265 is known to fit the following RV brands, but compatibility is not guaranteed. Please verify your specific model’s specifications before purchasing. This is not an exhaustive list — other models may also use this profile. Commonly Found On: • Entegra • Forest River • Heartland • Keystone • Tiffin Compatible Track & Wiper Seal Systems: This bulb seal slides onto either a dedicated track channel or a wiper seal with integrated track. Compatible Steele Rubber track and wiper parts (sold separately): • 70-4120-265 — Track Channel • Wiper seals with track in Small, Medium, and Large sizes Related Bulb Seal Profiles (for size comparison): • 7/8" Bulb Weatherstrip with Channel — smaller profile • 1-3/16" Bulb Weatherstrip with Channel — larger profile Always measure the existing bulb seal height (15/16") and width (1-1/8") and confirm that your wiper seal or track channel accepts this C-channel profile before ordering. Actual fit may vary based on individual models, production years, and manufacturing variations.
The domed channel is specifically designed for slide-out systems with cables routed along the track. Before ordering, confirm the following: • Does your slide-out have cables routed near the bulb seal track? If cables run beneath or alongside the track, the domed channel is the correct choice — a flat-bottom channel could pinch or abrade wiring during retraction • Measure the existing seal: Confirm your existing seal matches the 15/16" H x 1-1/8" W profile before purchasing • Check track type: This seal fits both a dedicated track channel (70-4120-265) and a wiper seal with integrated track — confirm which system your slide-out uses • Confirm run length: A 30 ft strip covers two to three sides of a standard single slide-out — measure all applicable sides before ordering to confirm this length is sufficient • No adhesive required: The C-channel slides onto the track mechanically — no surface preparation needed
Step-by-Step Installation: 1. Extend the Slide-Out: Fully extend the slide-out to access the bulb seal track and existing seal on the slide-out frame 2. Remove Old Bulb Seal: Slide the existing seal off the track channel or wiper seal track, working from one end along each applicable run 3. Inspect Track and Cables: Check the track channel for damage or debris. Note the routing of any cables — the domed channel is designed to clear these during installation and retraction 4. Cut to Length: Measure each side of the slide-out perimeter you are replacing and cut the new seal to the required lengths 5. Align C-Channel: Orient the domed side of the channel toward the track surface and align the channel opening with the track 6. Slide Onto Track: Starting at one end, slide the C-channel onto the track, working steadily along the full run on each side 7. Seat Fully: Confirm the C-channel is fully engaged on the track with no lifting or partial seating along the run 8. Retract and Test: Retract the slide-out and inspect the seal contact line against the RV wall — the bulb should compress evenly with no gaps. Confirm cables are clear and uncompressed inside the dome 9. Inspect Joints: Check that end joints between this strip and any adjoining seal run are snug with no gaps
In The Package: • One (1) continuous 30 ft strip of 90-3392-265 EPDM Bulb Seal With Domed C-Channel Recommended Companion Parts (Sold Separately): • 70-4120-265 — Track Channel (if replacing or adding a dedicated track) • Wiper Seal With Track (Small, Medium, or Large — if replacing the full system) • 90-3391-265 — Same Profile, 15 Ft (for single-side or top-seal jobs) • 90-3393-265 — Same Profile, 60 Ft (for full perimeter replacement) Recommended Tools (Not Included): • Sharp utility knife for cutting seal to length • Tape measure for measuring slide-out perimeter lengths • Flat blunt tool for seating the C-channel onto the track in tight sections
This bulb seal is available in four options to match the job size: By the Foot: For replacing a short damaged section or verifying that the domed C-channel fits your specific track before purchasing a longer strip 15 Ft Strip (90-3391-265): Covers one side of a standard single slide-out or a full top seal run. Best for single-side replacement or profile verification before a larger purchase 30 Ft Strip (This Item): Covers two to three sides of a standard single slide-out. The practical mid-range option for partial perimeter replacement when the full 60 ft roll is more than the job requires 60 Ft Strip (90-3393-265): Full-perimeter coverage for large single slide-outs or two sides of a dual slide-out. Minimizes field joints for the most consistent seal across the full perimeter Tip: Measure all sides of the slide-out perimeter you plan to replace and add 10% for cutting allowance. If you are replacing two or three sides, the 30 ft strip is almost always sufficient for a standard single slide-out without leftover waste.
The domed channel is a purpose-engineered feature for slide-out systems where electrical cables or wiring harnesses run along the slide-out frame beneath the bulb seal track. Using a flat-bottom channel seal on these systems risks progressive wire abrasion and insulation damage that is difficult to diagnose until a wiring fault occurs. The 30 ft strip provides enough material for a two-to-three-side partial perimeter replacement — the most common repair scenario on single slide-out systems with localized seal wear.