a) Channel drain square, prism

Off-communication hatch, cover, made of plastic prisms, reinforced by a threaded rod, is suitable for parks and places where no direct road traffic exists. The TOPlast, Inc. has the "Test Report" for this type of cover. The cover can be made in different thicknesses, mostly 4-7 cm, in any dimension from 30 x 30 up to 90 x 90.