EPDM rubber slide-out seal with rigid C-channel. Unique hourglass design. 1-3/16" H x 1-1/16" W — 15 ft roll. Black.
The Steele Rubber Products 90-3385-265 Slide-On Bulb Seal With Channel is an RV-grade weatherstrip engineered to keep moisture, wind, insects, and road debris out of your coach when your slide-out is fully retracted. Made from premium EPDM rubber, it resists UV fading, temperature extremes, shrinkage, and cracking — delivering long-lasting performance season after season.
The seal features a rigid "C" channel that slides directly into a track channel or onto a wiper seal with a track, making installation straightforward without adhesive. Its signature hourglass profile is specifically engineered to prevent side-flopping when the bulb is compressed, ensuring a consistent, tight seal all the way around your slide-out. The 15-foot roll is the ideal choice for smaller slide-outs, single-side replacements, or buyers who need just enough to complete the job without overpaying for extra material.
This part is also sold under the Steele Rubber Products part number 70-3834-265.
Blocks moisture, wind, insects, and road debris when your slide-out is fully closed
Unique profile prevents side-flopping under compression for a consistent seal around the full perimeter
Rigid C-channel slides onto a track channel or wiper seal with track — no adhesive required
Will not fade, shrink, or crack. Engineered to withstand UV exposure and temperature extremes
This seal is known to fit the 2010 Big Horn by Heartland fifth wheel and similar Heartland RV models, but compatibility is not guaranteed for all years and configurations. Please measure your existing seal carefully and compare against the dimensions (1-3/16" H x 1-1/16" W) before purchasing. Confirm that your slide-out uses a track channel or wiper seal with track, as this C-channel seal requires that style of receiver for proper installation.
Primary Part Number: 90-3385-265 Also Known As: 70-3834-265 Available Lengths (Same Profile): • 15 ft — Part 90-3385-265 (This Item) • 30 ft — Part 90-3386-265 • 60 ft — Part 90-3387-265 Note: For the compatible track channel, see part 70-4120-265. For a compatible wiper with track, see parts 70-3884-265 (Small), 70-3883-265 (Medium), or 70-3835-265 (Large).
What You Need: A compatible track channel (70-4120-265) or wiper seal with track already mounted on your slide-out. This seal does not use adhesive — the rigid C-channel slides directly into the receiver. Basic Installation Steps: 1. Measure & Cut: Measure the section of your slide-out opening needing replacement and cut the seal to length using a sharp utility knife or scissors 2. Clean the Track: Remove the old seal and clean the track channel to remove dirt, debris, and old rubber residue 3. Slide Into Place: Starting at one end, press the C-channel base of the seal into the track and work along the perimeter, ensuring the channel seats fully 4. Trim to Fit: Cut any excess at the end point for a clean, flush joint 5. Test the Slide: Extend and retract the slide-out to confirm the seal compresses evenly and does not bind or side-flop
Included: • One (1) 90-3385-265 Slide-On Bulb Seal With Channel • 15-foot pre-cut length • EPDM black rubber construction NOT Included — May Be Needed: • Track channel (see part 70-4120-265) • Wiper seal with track (see parts 70-3884-265, 70-3883-265, or 70-3835-265) • Installation tools (utility knife, tape measure)
Always verify seal dimensions against your existing weatherstrip before ordering. Compatibility is based on known fitment and may vary by individual RV model, production year, and manufacturing variations.