Plastic ventilation bend with socket formed part round with interior stop for connecting pipes by welding (or PVC bonding up to Ø 250). Manufactured by the process of injection moulding (Ø 50-400), blow moulding (Ø 450-600) or welding per segment (PVC from Ø 700, PP / PPs / PP-EL-s / PE / PVDF from Ø 560). Segment bends are available under the PVC-BSF code.