If you’re upgrading an RV, camper, or a home skylight, choosing the right outer and inner domes can improve light, reduce heat gain, and withstand rugged weather. This guide highlights five compatible skylight replacement options from XMK and HECASA, focusing on standard 14″ x 22″ and 22″ x 22″ openings. Each product emphasizes durable polycarbonate construction, UV protection, and a design that fits common skylight openings found on RVs, campers, motorhomes, travel trailers, and fifth wheels. Read on to compare key features and find the right match for your roof skylight project.
Buying Quick View
| Product | Brand | Opening Size | Outer Dome Size | Notes |
|---|---|---|---|---|
| XMK 26″ x 26″ Outer Dome | XMK | 22″ x 22″ | 26″ x 26″ | Fits most 22″ x 22″ openings; UV-coated outer dome |
| RV Skylight Replacement Bundle | XMK | 14″ x 22″ | 26″ x 18″ | Inner and outer domes included; anti-UV coating |
| XMK Inner Dome | XMK | 14″ x 22″ | 23.6″ x 16″ x 2.9″ | Clear inner dome; great light transmission |
| XMK 18″ x 34″ Outer Dome | XMK | 14″ x 30″ | 18″ x 34″ | High wind resistance; UV-protected |
| HECASA 18″ x 26″ Outer Dome | HECASA | 14″ x 22″ | 18″ x 26″ | Smoke, with options for clear or white; universal fit |
Choosing the right skylight replacement involves considering opening size, outer dome dimensions, UV protection, and whether you need an inner dome, outer dome, or both. The products listed here are designed for portability, weather resistance, and reliable light transmission, helping you maintain a bright interior while protecting against the elements.
XMK 26″ x 26″ Outer Dome Set
The XMK skylight replacement kit is designed for RVs, campers, and motorhomes with 22″ x 22″ openings. The outer dome, sized at 26″ x 26″, provides a protective surface that can endure wind and storms thanks to a robust polycarbonate construction. The dome features UV protection to minimize interior fading and heat buildup, while the interior light remains clear enough to enjoy daylight without compromising insulation. This option is especially suitable for replacing worn domes on showers, bathrooms, and living areas where natural light is welcome but glare must be managed.
Key features include:
- Outer dome dimension: 26″ x 26″; inner skylight opening: 22″ x 22″
- Impact-resistant polycarbonate with high-temperature tolerance
- UV-protected surface to shield RV interiors
- Wind and weather resistance with a wide roof flange
RV Skylight Replacement Bundle (Inner & Outer)
This bundle includes both inner and outer skylight domes designed for standard 14″ x 22″ openings. The setup traps air between the two domes to reduce heat transfer and improve indoor climate control, while the UV-protected outer dome guards against sun damage. The dimensions align with common ceiling thicknesses to ensure a snug fit. The kit is suitable for RVs, campers, food trucks, and travel trailers seeking better daylighting without compromising insulation.
Highlights:
- Outer: 14″ x 22″ x 4″; Flange: 26″ x 18″
- Inner: 14″ x 22″ x 4″; Flange: 16″ x 23 7/8″
- Thicker polycarbonate with UV protection
- Helps regulate interior temperature by reducing heat transfer
XMK Inner Dome, 14″ x 22″
The XMK inner dome is a focused solution for standard 14″ x 22″ skylight openings. The dome measures 14″ x 22″ with a 2.9″ thick outer flange, ensuring a secure seal and adequate surface for fasteners. This inner dome is typically installed with an outer dome to maximize light while maintaining temperature control. It’s suitable for RVs, campers, food trucks, and shower areas where a clear interior view enhances the feel of space.
Core points:
- Fits 14″ x 22″ inner openings
- Clear interior window for optimal daylight
- Outer flange sized to help with installation stability
- Compatible with various RV configurations
XMK 18″ x 34″ Outer Dome
This outer dome is intended for 14″ x 30″ skylight openings, with an outer dimension of 18″ x 34″. The larger flange design enhances wind resistance and provides a robust interface with the vehicle roof. The outer dome is built from durable polycarbonate and includes UV protection to minimize interior sun damage. It’s a practical option when upgrading skylight performance for taller profiles or areas with heavy sun exposure.
Key attributes:
- Outer dome: 18″ x 34″; fits 14″ x 30″ openings
- Durable polycarbonate with UV shield
- Wind-resistant roof flange design
- Suitable for campers, trailers, and fifth wheels
HECASA 18″ x 26″ Outer Dome
HECASA offers an 18″ x 26″ outer dome designed for 14″ x 22″ openings. This universal fit is intended for RVs, campers, travel trailers, and motorhomes. The outer dome is manufactured from sturdy polycarbonate with UV protection to block excessive heat and protect interior finishes. The option to choose between smoke, clear, or white variants gives flexibility depending on desired brightness and privacy levels in the RV interior.
Notable features include:
- Outer dimension: 18″ x 26″; fits 14″ x 22″ openings
- Polycarbonate construction with weather resistance
- UV filtering and various color options
- Wide compatibility with common skylight openings
XMK 18″ x 26″ Outer Dome With 14″ x 22″ Opening
This option covers 14″ x 22″ openings with an outer dome measuring 18″ x 26″. It features durable polycarbonate that resists impact and harsh weather, plus UV protection to minimize interior heat gain. The broad flange area helps secure the dome against wind uplift, making it suitable for roof installations on RVs and trailers where outdoor exposure is high.
Highlights:
- Outer: 18″ x 26″; opening: 14″ x 22″
- Impact-resistant polycarbonate; UV protective coating
- Wind-friendly flange design
- Clear viewing option to enjoy daylight
Kojem 18″ x 26″ Outer Dome
Kojem offers an 18″ x 26″ outer dome designed to fit 14″ x 22″ inner openings. The dome is made from polycarbonate with UV resistance to endure outdoor conditions. It’s a versatile option for RVs, campers, and food trucks, designed to shield interiors from rain and debris while maintaining adequate daylight.
Key points:
- Outer: 18″ x 26″; Inner: 14″ x 22″
- UV-resistant polycarbonate for long-term use
- Suitable for RVs, campers, and travel trailers
- Prevents leaves and water entry while letting light in
Buying Guide
When selecting skylight replacements, consider the following factors to ensure a proper fit and long-lasting performance:
- Opening compatibility: Measure the inner opening (e.g., 14″ x 22″ or 22″ x 22″) and confirm the outer dome dimensions to fit your roof hatch with enough flange for a secure seal.
- Material: Polycarbonate offers impact resistance and weather durability, with UV coatings to protect interior furnishings.
- UV protection: UV coatings reduce interior fading and heat buildup, contributing to energy efficiency.
- Light transmission vs. privacy: Clear domes maximize daylight, while smoke or tinted finishes provide privacy and heat reduction.
- Inner vs. outer domes: Some bundles pair both inner and outer domes to improve insulation and climate control by trapping air between domes.
- Installation clearance: Ensure ceiling thickness and flange dimensions accommodate your vehicle’s roof structure and any interior trim.
- Color options: Smoke, clear, and white finishes affect brightness and glare; choose based on desired ambiance and privacy needs.
For many RV owners, replacement domes are part of a broader upgrade to improve daylighting, reduce heat transfer, and extend roof life. By selecting a kit that matches your opening size and weather conditions, you can restore a bright, comfortable interior with enhanced protection against the elements.