I am burying my downspouts and cannot find an adaptor that will allow me to connect the 3" x 4" downspout to a 4" plastic drain tile. I can however find an adaptor for 3" drain tile. My questions are: Does anyone know where I can find 3" x 4" adaptors and if not can I use 3" drain tile? I have a 3,000 sq ft roof with 7 down spouts. Each will have its own drain tile. Also do I use perforated or solid tile? I don't want the perforated right next to the foundation.