160mm Backwater Valve Single Flap – Capricorn

Product Description

This 160 mm Single-Flap Backwater Valve is designed to prevent reverse flow in drainage systems—ideal for blocking wastewater, stormwater, or sewage backflow into properties. The flap opens in the forward direction under normal flow but closes automatically when pressure reverses, offering protection during heavy rainfall, blockages, or surcharged sewer conditions. A practical component for both retrofit and new subterranean drainage installations, it helps maintain hygiene, protect interiors, and minimize flood risk.

Constructed from durable PVC, it features a single flap (usually stainless steel) for simplicity and reliability. The valve’s body is sized for 160 mm pipes, making it suitable for larger drainage runs or connecting to stormwater mains. Its design keeps obstruction minimal so that normal flow is not impeded, while the flap seals tightly when needed.

Key Features

• Suits 160 mm drainage pipe size

• Single flap mechanism to allow flow one way, prevent backflow

• PVC body material — durable and suitable for buried use

• Tight flap seal to block reverse pressure and prevent ingress

• Compact design, with minimal obstruction under normal flow

Benefits

• Flood protection: Helps stop backwash or sewer surges from entering buildings

• Simple and reliable: Fewer moving parts than multi-flap designs—easier maintenance

• Low flow impact: The flap design maintains smooth forward flow during normal operation

• Durable construction: Materials suited for underground exposure and long service life

• Safety & hygiene: Prevents odours, pests, and contaminated water from reversing into property

For more drainage fittings, see here.