Monitor and drain your grey water without unhooking the valve. This clear 3-inch cap fits your standard black waste valve with a secure bayonet fitting, and the integrated hose connector lets you attach a flushing line for off-site drainage. A retention strap prevents accidental loss during manoeuvres, while the built-in seal stops leaks and odours.

• Bayonet fitting, 3-inch diameter
• Clear plastic to see water level
• Integrated hose connector
• Leak-proof seal with retention strap