"What can I say about mini access chambers and components except they are easy to fit, durable and the flexible connectors make it easier to tie in new work. The risers give added versatility. I have used these for nearly 7 years on a self build and one has survived being driven over a few times with my jcb although shouldnt be subjected to this treatment. It also had a cement lorry with 9 cu metres of concrete drive over it. The plastic lid popped loudly and cracked but the rest survived. A good overall product."