Interior ceiling piece — installs from inside the RV. White polycarbonate throughout. Fits 15"×18" ceiling openings. 17"×20" outer flange. 4" bubble height. Made in the USA.
The N1518 is an inner garnish — it installs on the interior ceiling of your RV to finish the inside of a 15"×18" skylight opening. It is not a roof-mounted outer dome. No roof access is required for installation. If you need the exterior roof-mounted dome for a 15"×18" opening, see the SL1518C (clear outer dome) sold separately.
The Specialty Recreation N1518 is the interior ceiling garnish for RVs with 15"×18" ceiling openings. The 15"×18" format is a less common size — found on certain RV brands and models rather than across the industry broadly. White polycarbonate throughout provides maximum light transmission from the exterior skylight through to the interior space below.
At 4" bubble height it fits most standard ceiling-to-roof clearances for this skylight size. The 17"×20" flange seats flat against the ceiling surface with a 1" overlap on all sides of the 15"×18" opening. Smooth glossed surface is easy to clean from inside the coach.
Installs from inside the RV — no roof access needed. Replaces the interior dome visible from inside the coach
Specific fit for 15"×18" ceiling openings — measure carefully, not interchangeable with 14"×22" or other common sizes
Uniform white polycarbonate — maximizes light from the exterior skylight through to the interior space
Specialty Recreation manufactures their skylights domestically — 1-year warranty
Unlike outer dome skylights, inner garnishes must match the ceiling hole size exactly. This skylight fits a 15"×18" ceiling opening only. Measure your ceiling opening carefully before ordering — the 15"×18" size is easily confused with the more common 14"×22" or 16"×26" rectangular sizes.
The Specialty Recreation Inc. product warranty covers defects in workmanship and materials for 1 year from the date of purchase. Warranty does not apply to damage caused by improper installation. Note: Some product listings reference a 90-day warranty term; Specialty Recreation's published warranty policy is 1 year.
• (1) N1518 White Rectangle Inner Garnish NOT Included: • Sealant • Mounting hardware/screws • Exterior outer dome (sold separately if needed)
Interior Only: Installs from inside the RV — no roof access required. Hole Size Must Match Exactly: Ceiling opening must be exactly 15"×18" — inner garnishes require an exact size match. No Sealant Included: If sealant is needed, use only a polycarbonate-compatible product — do not use self-leveling lap sealant.
SL1518C — Clear outer dome for 15"×18" opening (roof-mounted) — pairs with this inner garnish for a complete installation Need a different size? Common rectangular inner garnishes include N1422 / N1422D (14"×22") and N1626 (16"×26").