{"product_id":"320mm-450mm-underground-chamber-riser-inspection-chamber-height-extension","title":"320mm \u0026 450mm Underground Chamber Riser | Inspection Chamber Height Extension","description":"\u003cp\u003eThis underground chamber riser is designed to increase the height of compatible inspection chambers so the finished cover level matches surrounding ground, commonly used during new drainage installations or when raising existing chambers after paving, patio or landscaping works.\u003c\/p\u003e\n\u003cp\u003eManufactured from polypropylene with a supplied joint seal, it's available in 320mm diameter (400mm rise, for smaller domestic systems) or 450mm diameter (300mm rise, for larger or higher duty installations).\u003c\/p\u003e\n\u003ch2\u003eBenefits of the 320mm \u0026amp; 450mm Underground Chamber Riser | Inspection Chamber Height Extension:\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUnderground chamber riser for raising inspection chamber height\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable in 320mm and 450mm diameter options\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLightweight polypropylene construction\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eNon-rusting design for underground use\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eSupplied with joint seal\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eIdeal for driveway, patio and landscaping level changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eProduct Specifications:\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e Polypropylene (Grade AP9)\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSeal material: \u003c\/strong\u003eEPDM rubber\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eColour:\u003c\/strong\u003e Black\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpec\u003c\/th\u003e\n\u003cth\u003e320mm Diameter (CD U355)\u003c\/th\u003e\n\u003cth\u003e450mm Diameter (CD U455)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClear opening\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e320mm\u003c\/td\u003e\n\u003ctd\u003e450mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eExternal diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNot specified\u003c\/td\u003e\n\u003ctd\u003e500mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverall height\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e440mm\u003c\/td\u003e\n\u003ctd\u003e340mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRise height\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e400mm\u003c\/td\u003e\n\u003ctd\u003e300mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApprox. weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2.6kg\u003c\/td\u003e\n\u003ctd\u003e3.5kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLoad rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35kN (3.5 tonnes) when correctly installed\u003c\/td\u003e\n\u003ctd\u003eUp to B125 (12.5 tonnes) when correctly installed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible bases\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCD U351 \/ CD U353\u003c\/td\u003e\n\u003ctd\u003eCD U453\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"EcoGrid - Manhole Covers","offers":[{"title":"320mm","offer_id":64732732490105,"sku":"CD U355","price":22.79,"currency_code":"GBP","in_stock":true},{"title":"450mm","offer_id":64732732522873,"sku":"CD U455","price":20.96,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0356\/6364\/2669\/files\/320mm_Underground_Chamber_Riser_Inspection_Chamber_Height_Extension.png?v=1790695399","url":"https:\/\/drainagesuppliesdirect.co.uk\/products\/320mm-450mm-underground-chamber-riser-inspection-chamber-height-extension","provider":"Drainage Supplies Direct","version":"1.0","type":"link"}