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 90-3393-265 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 — an important distinction on slide-out systems where wiring runs beneath or alongside the bulb seal track. Commonly found on Entegra, Forest River, Heartland, Keystone, and Tiffin RVs. Available by the foot and in 15 ft, 30 ft, and 60 ft pre-cut lengths.
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
Full 60 ft strip for complete single slide-out perimeter replacement or two sides of a dual slide-out. Hand crafted by Steele Rubber Products
The 90-3393-265 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 appropriate 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 perimeter length: The 60 ft strip covers a full large single slide-out perimeter or two sides of a dual slide-out — measure all sides before ordering • 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 the full perimeter 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 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 Corners: Check that corner transitions are snug where adjacent strip ends meet
In The Package: • One (1) continuous 60 ft strip of 90-3393-265 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) • Same profile in shorter lengths: 15 Ft and 30 Ft strips available for partial 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 full-length strip 15 Ft Strip: Covers one side of a standard single slide-out or a full top seal run. Use for single-side replacement or top-seal-only jobs 30 Ft Strip: Covers two to three sides of a standard single slide-out — a practical mid-range option for partial perimeter replacement 60 Ft Strip (This Item): Full-perimeter coverage for large single slide-outs or two sides of a dual slide-out. Minimizes the number of field joints for a more consistent seal across the full perimeter Tip: Measure all sides of the slide-out perimeter and add 10% for cutting allowance before selecting your length. Purchase by the foot first if you need to verify the domed channel fit on your specific track before committing to a longer strip.
The domed channel is not simply a cosmetic variation — it 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 domed channel eliminates that risk while delivering identical weathertight sealing performance at the RV body wall.