The valve box insert is made of ultra-lite density polyethylene copolymer material that meets ASTM specifications designation D 1248, Class, Category 5, Type 111 with a minimum impact brittleness temperature of -180 degrees Fahrenheit. The thickness shall be uniform to .187 or greater. This material is composed of MARLEX HXM 50100....extra high molecular weight Hexene copolymer or can also be made with acrylonitrile butadiene styrene or A.B.S. plastic.
The Lift Strap is made of 1 inch wide woven polypropylene web and is attached to the bowl of the dish by a wide head stainless steel 3/16" rivet and a stainless steel 3/4" backup SS washer. All cut edges are seared to insure against raveling.