For use in fixed axle campers or utility trailers that are converted into ice houses. Re-designed for 2018-19. Our new 18" Hole Sleeves are injection molded from the same cold-weather polymer used in Original Catch Covers. Super durable and easy to stack, the new 18" sleeves are compatible with our Safety Covers and feature full 1" trim lines so you can easily and neatly cut them to the perfect height for your ice house. Catch Cover Holes Sleeves keep you warmer and quickly pay for themselves in propane saved.