Precast concrete driveway drain troughs with cast iron strip grates allow for simple installation – no formwork required! Drain troughs are wet-cast with a smooth top surface for high end homes and commercial projects. Thin walled, reinforced and tight flat ends – weighing only 155 lb. per section, drain troughs can be installed by one person without machinery. Small square patio drains fit nicely into a paving stone patio.