Absolute Marine 80 Litre Waste Water Holding Tank, Seamless Odour-Tight, Space-Saving Bulkhead Mount For Boats And RVs

The 80 litre Holding Tank Waste Water MWW80W is a robust, odour-tight solution designed for marine and mobile installations where space is at a premium. This bulkhead-mountable tank handles both black water and greywater with a seamless, odour impermeable construction that helps keep smells contained and maintenance simple.

• Capacity: 80 litres
• Material & build: seamless polythene with odour impermeability
• Installation flexibility: bulkhead mounting, ideal for confined spaces or situations where underfloor installation is impractical
• Visibility: contents level can be seen from the outside
• Waste compatibility: suitable for both “black” water and greywater
• Inclusion of fittings: suction pipe with 38 mm angled hose connector for deck plate; 38 mm angled discharge hose connector; inspection cover; 19 mm angled vent (breather)
• Inlet provisions: one inlet hole already provided; additional inlet connectors can be ordered separately
• Discharge method: gravity discharge at sea when permitted, simply by opening the sea cock
• Mounting location: suitable for mounting under side decks, above the waterline
• Identification: ISO 8099 identification
• Dimensions: 665 x 570 x 350 mm
• Product code: MWW80W

Designed to fit into tight spaces, this tank offers a reliable, low-maintenance waste storage solution for boats and mobile setups. The gravity-discharge feature reduces the need for pumps in compliant configurations, simplifying plumbing and lowering potential failure points.

Ideal for sailboats, motor yachts, houseboats, and caravans where space is scarce, the MWW80W can be mounted behind cabinetry or in bulkheads to keep waste management out of sight while remaining accessible for service. Its clear external sight line for the contents level makes routine monitoring straightforward, so you know when it’s time to empty.

Practical tips: install above the waterline as recommended, keep the sea cock accessible for permitted gravity discharge, and use compatible inlet and vent fittings if you modify the system. The MWW80W adheres to ISO 8099 standards, ensuring safe, compatible operation within marine waste systems.