Inspection Chambers Q. What Depth Can a Inspection Chamber Be Installed To? A. The Building Regulations Document, April 2002 allow Inspection Chambers to be installed up to 1.2metres in depth Q. What type of usage is the Amazon Civils 450mm Cover & Frame made for? A. Amazon Civils 450mm Cover & Frame is made for use in pedestrian access areas Q. What type of usage is the Amazon Civills 320mm Cover & Frame made for? A. Primarly for garden and patio area usage. Q. Should lubrication of the seals be used prior to installation? A. Yes, all seals should be lubricated or greased when making a connection Q. What is the depth of Your 450mm Riser? A. The depth of the 450mm Riser is 230mm. Q. What is the depth of your 320mm Riser? A. The depth of the 320mm Riser is 150mm. Drainage Q. Is your Plastic drainage system compatible with other plastic manufacturers drainage system? A. Yes; our drainage systems are fully compatible with all systems manufactured to the British Standards Q. Do you Manufacture a trapped roddable gully? A. Yes; Amazon Civils manufacture a trapped roddable bottle gully which is supplied complete with a round top. Q. Should lubrication of the seals be used prior to installation? A. Yes, all seals should be lubricated or greased when making a connection Customer Service Q. Do you manufacture your own products? A. All of our products are manufactured in our factory in the West Midlands Q. Is Amazon Civils a ISO registered company? A. Yes; Our certificate Number is FM537251