Ultraplay® Barkpark Recycled Crawl Tunnel With Dog House, The Same Great Crawl Tunnel You Know And Love With A Heavy-duty 100% Plastic Structural Frame. The Crawl Tube With Spyholes Allows Interior Brightness And Supervision And The Large Diameter Tunnel Allows Entry By Most Dogs. Featuring An Optional Dog House Entry To Bring A Little Personality To Your Dog Park. This Product Is Available As In-ground Or Surface Mount.