Diamond Dome Sunpipe 450mm/18" 2 - Section Adjustable 30dg Elbow A critical part of the 450mm Diamond Dome Sunpipe system, the adjustable elbow allows you to work more flexibility in your sunpipe design. Adjustable to a maximum of 30dgs, the 2 section adjustable sunpipe elbow allows extra flexibility and manipulation over the direction of natural light to your desired room. Able to be used in conjunction with other sunpipe elbows the possibilities are endless.