External Grease Traps

External Grease Traps

Hydromechanical Grease Separation

Hydromechanical Grease Separators separate Fat, Oil and Grease (FOG) from greasy water which typically results from the preparation and service of food.  The term Hydromechanical Grease Trap means a design that incorporates air entrainment, hydromechanical separation, interior baffling, or barriers in combination or separately.

In the past concrete was commonly used in the manufacture of grease traps but the presence of acids in greasy waste resulted in corrosion and breakdown of the unit within as little as 10 years.

MACTRAP manufactures grease separators from High Density Polyethylene (HDPE) which remains totally unaffected by greasy water acidity allowing us to provide a 30 year warranty with all inground units – a strong financial motivation for building owners.

The benefits of MACTRAP grease separators start at installation. Because they are lightweight and easy to transport and maneuver they require less machinery and time to install saving up to 50% of upfront costs. If your application requires a custom size or configuration we can typically design and build to meet those requirements within four weeks.

MACTRAP manufactures products to support New Zealand’s environmental goals and all of our products comply with the NZBC G13.

Polymer grease separator systems are a superior alternative to concrete solutions as they do not need to be refurbished, even after many years.


Only New Zealand grease separator with an inground 30 year warranty against leak tightness and structural integrity.

HDPE polymer is lightweight and manoeuvrable saving up to 50% of installation costs.

Above and below ground options with vehicular and pedestrian risers and covers

Welded frame with 12mm wall thickness for robustness and reliability

Increased baffles and chambers for greater efficiency

Flexible couplings for earthquake protection

Handles harsh chemicals, heavy FOG, and temperatures up to 65°C

The polyethylene material used is resistant to aggressive fatty acids – and therefore particularly durable. We provide a 30-year warranty for leak tightness, fitness for purpose and structural safety of tanks and upper sections.


S = Above Ground Standard
A = Below Ground Pedestrian
D = Below Ground Vehicular
Treatment Capacity
MTPT75 (above ground only) 58 605 400 350
MTPT125 (above ground only) 97 730 430 430
MTPT250 (S) (A) (D) 252 1200 500 600
MTPT500 (S) (A) (D) 515 1500 550 850
MTPT750 (S) (A) (D) 726 1500 750 870
MTPT1000 (S) (A) (D) 946 1500 850 1000
MTPT1500 (S) (A) (D) 1550 2500 800 1000
MTPT2000 (S) (A) (D) 1980 3000 800 1050
MTPT2500 (S) (A) (D) 2460 3000 800 1250
MTPT3000 (S) (A) (D) 2940 3000 800 1450
MTPT6000 (A) (D) 5670 3000 1200 1850

75L Data Sheet 125L Data Sheet 250L Data Sheet 500L Data Sheet 750L Data Sheet 1000L Data Sheet
1500L Data Sheet 2000L Data Sheet 2500L Data Sheet 3000L Data Sheet 6000L Data Sheet

Internal Lift Pump

Treatment Capacity
MTPT250 LP 165 1200 500 600
MTPT500 LP 460 1500 550 850
250LP Data Sheet 500LP Data Sheet

Covers and Risers

Mactrap separators are available with Class D Vehicular lids in cast iron, and Class A Pedestrian lids in HDPE.

Flexible coupling allows easy installation into the surrounding medium.

The risers and covers are fully sealed.

The riser mounts are pre-welded and the riser flanges and screw on lids are provided separately. The riser flanges and screw on lids are installed once the exact height of the installation is known. The risers can be cut on site to the required height.

Surrounding concrete or other medium must be engineered for the appropriate loading.

Further Information

Brochure Pumping Solutions Greasy Lift Pump

Support • Information • Design • Sizing

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