Larger-capacity grease management
Passway™ | M-43D
A 140L Passway™ gravity grease separator for higher-demand kitchens and commercial grease-management applications.
The M-43D uses solids interception, controlled flow, internal baffles and gravity separation to retain fats, oils, grease and food-related solids for routine removal before wastewater continues downstream.
Total capacity140L
Larger Passway™ unit
Water capacity72L
Operating water volume
Grease capacity61L
FOG storage
Independent testNS1
BS EN 1825-1
Product background
Robust grease management for higher-load kitchens
The Passway™ M-43D is the larger grease separator within the current WCTNZ® Passway™ range.
Kitchen wastewater first passes through the inlet and food-solids interception components before entering the main separation chamber. Lower-density fats, oils and grease rise while heavier material can settle.
Internal baffles and the outlet arrangement help reduce direct carry-over into downstream drainage, septic systems, pump stations, greywater equipment or wastewater treatment systems.
The outlet remains wastewater. The M-43D reduces FOG and retained solids but does not produce potable, purified or disinfected water.
Best suited for
Commercial kitchens and higher-demand sites
- Commercial kitchens with higher grease and food-solids loading.
- Cafés, hospitality sites, food-preparation areas and facility kitchens.
- Installations requiring a larger grease-storage volume.
- Sites where downstream drainage, septic, pumping or treatment systems need protection from FOG loading.
- Projects where inspection access and documented servicing form part of normal operation.
Final suitability must be confirmed from the connected fixtures, peak wastewater flow, wastewater temperature, grease loading, cleaning products, plumbing layout and required service interval.
Core specifications
M-43D product details
Product type
Passive / gravity grease separator for kitchen and food-service wastewater.
Dimensions
Approximately 850mm long × 500mm wide × 600mm high.
Product weight
Approximately 24.5kg.
Operating water capacity
72L.
Connection configurations
100mm and 125mm inlet/outlet configurations are identified in the WCTNZ® Passway schedule. Reducing / expander arrangements may also be available for smaller incoming kitchen lines. Confirm the complete configuration before ordering.
Material
Polypropylene — PP (Kopelen).
Heat resistance
Manufacturer-stated material heat-resistance temperature: 110°C.
Standard cover rating
A15 / Class A — pedestrian areas only.
Riser option
Compatible with the Passway™ M-43D 150mm tank riser.
Strong features
Durable construction and accessible servicing
- Food-solids interception ahead of the main separation chamber.
- Internal baffles control flow and help reduce grease and sediment carry-over.
- Air-intake and gas-relief arrangement supports intended hydraulic behaviour.
- Stainless-steel side latches provide secure cover retention and service access.
- Rubber cover packing helps control leakage and nuisance odour.
- Removable internal components support inspection and routine cleaning.
- Optional 150mm riser supports deeper installation layouts.
The standard A15 / Class A cover is for pedestrian areas only. It must not be exposed to vehicle, forklift or other loads beyond its stated classification.
Independent performance evidence
Tested to BS EN 1825-1
The M-43D is supported by a Declaration of Performance and independent laboratory testing against BS EN 1825-1.
Test standard
BS EN 1825-1:2004 — Grease separators.
Independent laboratory
Danish Technological Institute.
Tested flow
1.0 litre per second under the BS EN 1825-1 test method.
Separation test result
Arithmetic mean residual hydrocarbon concentration: 20.6mg/L under the prescribed laboratory test procedure.
Test limit
The report identifies a maximum of 25mg/L under the applicable BS EN 1825-1 test procedure.
Laboratory testing is controlled product-performance evidence. Actual kitchen wastewater varies with flow, grease load, temperature, solids, detergents, installation and maintenance. The laboratory result is not a guaranteed field discharge concentration or automatic trade-waste approval.
New Zealand compliance
BS EN 1825 evidence with a New Zealand installation basis
New Zealand G13/AS2 provides a prescriptive grease-trap Acceptable Solution based on physical sizing and installation requirements. The M-43D has a total volume above the general 100L minimum, but final G13/AS2 applicability still depends on the connected fixtures, use and complete installation.
Where the proposed design differs from the Acceptable Solution, the independent BS EN 1825-1 evidence may support a Building Code Alternative Solution together with appropriate sizing, plumbing, drainage, installation and maintenance information.
Current G13/AS3 references AS/NZS 3500.2:2021 for sanitary plumbing and drainage where that compliance route applies.
Commercial premises may also require separate wastewater-network or trade-waste approval. Product testing does not automatically approve the discharge from a particular commercial kitchen.
Installation and maintenance
Designed for routine servicing
Install the M-43D with reliable access for complete cover removal, internal inspection, basket cleaning and grease removal.
Correct base preparation, pipe support, alignment, drainage fall and clean-water commissioning are important for predictable operation.
Inspect the separator early after commissioning so the ongoing service interval can be established from the actual grease and solids accumulation at the site.
This product is intended for fats and oils associated with kitchen and food wastewater. It is not a petrol, diesel, motor-oil or light-mineral-liquid separator.
WCTNZ® support
Passway™ product and technical guidance
WCTNZ® supplies and supports Passway™ grease-management products in New Zealand and can provide product information, technical evidence and practical selection support for proposed installations.
