... Well insulated,low maintenance Composite Drain Cover, FRP Fiberglass Drain Grating,Round or Square The FRP composite drain cover adopts model T material ... We also can use the mould grating as the composite drain cover, the mesh size are varities for choice. ... pollution,Less energy consumptionLarge pollution,and energy consumption Composite Drain Cover, FRP Fiberglass Drain Grating,Round or Square