450mm. Use with 5-inlet inspection chambers. Can be cut to size in 60mm increments with an additional 60mm at the top. Can use a maximum of 12 risers to meet the maximum inspection chamber invert depth of 3m.
We've noticed that you have cookies disabled. Screwfix.com requires cookies to be enabled in order to work properly - find out how to enable cookies. If you'd prefer not to enable cookies you will be able to view products but won't be able to purchase. Remember you can shop with us on the phone on 0500 414141 (mobile friendly 01935 414141) or at over 280 stores.