Mainline Backflow Products has introduced the Mainline Adopt-A-Valve extendable backwater valve, made extendable with a standard 4" DWV. The extendable cassette allows deep burial access without the need of a manhole. The valve features an extension ring for ground level or floor level access, along with an extention adaptor and a reversable cassette feature. Mainline Backflow Products.
ASPE Product Overview--Extendable Backwater Valve
December 16, 2002