All 8" Internal Width Channels (GRP) Home » Products » Trench Drains » Glass Reinforced Polyester (GRP) & Plastic Trench Drains » GRP Channels » 8" Internal Width Channels (GRP) T2000-PB-13 8″ Glass Reinforced Polyester (GRP) Channel with Galvanized Steel Edge Rail T2000-PB-3 8″ Glass Reinforced Polyester (GRP) Channel with Stainless Steel Edge Rail T2000-PB 8″ Glass Reinforced Polyester (GRP) Channel with No Edge Rail T2060-PB Shallow Bottom Channel