Two parallel hollow half-round bulbs in a single wide EPDM extrusion — double the sealing contact area of a standard single half-round. Closed-cell core with solid skin surface. Weather-resistant 3M Peel-N-Stick adhesive. Ideal for wide-frame RV compartment doors, hatches, and access panels. 15 ft strip — ideal for one to two compartment doors or profile verification before a larger purchase. Hand crafted and made in USA.
The Steele Rubber Products 90-3521-277 is a double hollow half-round peel-and-stick EPDM seal that provides weathertight protection for RV compartment doors, hatches, and access panels. What sets this seal apart from a standard single half-round is the double-bulb extrusion profile: two parallel hollow half-round chambers running side by side across a 1-5/16" wide base, delivering double the compression contact area in a single strip. This makes it particularly well-suited for wider door frames where a single half-round would leave sections of the frame surface unsealed, or where maximum weather protection across a wider sealing footprint is needed.
Unlike standard open-cell foam seals, the 90-3521-277 is constructed with a closed-cell EPDM core surrounded by a solid skin surface, which provides greater weather and wear resistance, better compression recovery, and no moisture absorption. Installation is tool-free thanks to the weather-resistant 3M Peel-N-Stick adhesive backing — clean the surface, peel the liner, and press firmly into place. The 15 ft strip is ideal for one to two compartment doors, a partial replacement job, or verifying that the double half-round profile matches your existing seal before committing to a longer strip. Also available in 30 ft and by the foot, this seal is backed by Steele Rubber Products’ 100% Satisfaction Guarantee.
Two parallel hollow bulbs in one extrusion deliver double the compression contact area of a single half-round — better coverage on wider door frames
Closed-cell construction with solid skin surface resists moisture absorption, compresses evenly, and recovers its shape after door cycling
Weather-resistant 3M adhesive tape bonds immediately on contact; allow 72 hours for full adhesion strength on the bonding surface
Hand crafted by Steele Rubber Products from high-quality EPDM sponge rubber with a 100% Satisfaction Guarantee
The double hollow half-round profile is well-suited for the following RV applications: Wide-Frame Exterior Compartment Doors: Provides full-width sealing coverage on door frames too wide for a single half-round seal Exterior Access Panels and Hatches: Double-bulb profile creates a redundant compression barrier for better weather protection on frequently accessed panels Battery Compartment Doors: Wide sealing footprint prevents moisture intrusion around compartment doors housing electrical components Utility and Pass-Through Compartments: Effective replacement seal for large compartment door openings on fifth wheels and Class A motorhomes Outdoor Kitchen Compartments: Wide profile handles uneven frame surfaces common on outdoor kitchen door perimeters No specific RV model fitment data is available for this part. The double hollow half-round profile is a general-application seal suitable for any RV compartment door or hatch where the 1-5/16" wide x 3/8" high double-bulb profile fits the door frame surface. Always verify dimensions and mounting surface width before ordering.
The bonding surface must be completely clean and dry before applying the seal for maximum adhesion strength. • Remove all old seals, adhesive, and residue using a general-purpose adhesive cleaner or rubbing alcohol • Allow the surface to dry completely — applying over wet cleaner prevents adhesion • Apply within the recommended temperature range: 60–104°F (15–40°C) • Minimize the temperature difference between the seal and the bonding surface • The 3M adhesive bonds immediately on contact — work carefully and do not remove all tape backing at once For full perimeter compartment door installations, apply a small amount of cyanoacrylate adhesive (super glue for rubber) at end-to-end corner joints to prevent lifting at the corners. Allow 72 hours after application for full adhesion strength before exposing the seal to water or heavy weather.
Step-by-Step Installation: 1. Remove Old Seal: Pull the existing weatherstrip from the door frame, working around the full perimeter 2. Clean the Surface: Remove all old adhesive, residue, and debris using general-purpose adhesive cleaner or rubbing alcohol 3. Dry Completely: Allow the bonding surface to dry fully — applying over damp cleaner will prevent adhesion 4. Check Temperature: Confirm both the seal and bonding surface are between 60–104°F (15–40°C) 5. Cut to Length: Measure and cut the strip to fit each door section using a sharp utility knife or scissors 6. Peel & Apply: Remove the backing a few inches at a time — do not remove all backing at once 7. Press Firmly: Apply steady, even pressure along the full length of the seal as you go 8. Corner Joints: Apply a small amount of cyanoacrylate (super glue for rubber) at end-to-end corner joints for full perimeter seals 9. Allow to Cure: Seal bonds immediately on contact; allow 72 hours for full adhesion strength
In The Package: • One (1) continuous 15 ft strip of 90-3521-277 Peel-N-Stick Double Hollow Half Round RV Seal • 3M adhesive backing pre-applied and protected by release liner Recommended Supplies (Not Included): • Adhesive cleaner or isopropyl rubbing alcohol for surface preparation • Disposable rags or shop towels • Steele Rubber Scraper/Tuck Tool (optional, aids clean installation) • Cyanoacrylate adhesive (super glue for rubber) for corner end-to-end bonding on full perimeter seals • Sharp utility knife or scissors for cutting seal to length
Both profiles are used on RV compartment doors, but they serve different frame widths and sealing requirements: Single Hollow Half-Round: Standard profile for narrow-frame compartment doors. Available in small (9/32" x 3/8") through medium profiles for most common RV compartment applications. Double Hollow Half-Round (This Seal): The 1-5/16" wide double-bulb profile covers wider door frames in a single application and creates a redundant sealing barrier with two compression points. Ideal when a single-bulb seal leaves uncovered frame surface or when extra weather protection is required on a frequently used compartment door. Tip: If you are unsure which profile matches your existing seal, remove a short section of the old seal and compare its width and profile to the 1-5/16" W x 3/8" H double half-round cross-section before ordering. The 15 ft strip is also a practical way to verify fit at lower cost before purchasing a 30 ft roll.
The double hollow half-round profile is the right choice when a wider sealing surface is needed, when a single-bulb seal has left gaps at the edges of a door frame, or when replacing an existing double-bulb seal with a direct profile match. The 15 ft strip makes it easy to confirm fit and complete smaller jobs without committing to a full 30 ft roll.