Products of synthetic material, namely, non-metal gutters, non-metal gratings, non-metal manhole covers and non-metal vent covers, non-metal siphons for dewatering systems for building purposes, non-metal gullies in the nature of plastic conduit for drainage, pipeline systems, namely, non-metal pipe collars and non-metal drainage pipes; non-metal paving slabs, non-metal honeycombed grids for use in stabilizing grass surfaces and kerbs, namely, non-metal paving blocks, kerb-stones, namely, pav...