Overview
The Filter-Cut is where DUMAC began. It’s a vertical column waste pump with a genuine cutting action — hardened steel tips on the impeller work against a perforated steel plate to chop through solids before they even get into the pipe. There’s also an agitator blade underneath that keeps the liquid moving so nothing settles.
We make two versions. The “A” model has a fully self-contained oil lubricated seal chamber — it’s the newer design and the most popular. The “W” model uses a water lubricated lower bearing, which is the original design that’s been running in the field for over 40 years. Both do the job well; it just depends on your preference.
What Sets It Apart
Hardened steel tips and a perforated plate create a guillotine effect with just .020″ clearance.
When the tips wear down, you swap them out. No need to replace the whole impeller.
A hardened steel blade below the suction side keeps liquids circulating so solids don’t settle.
“A” Model with oil lubricated seals, or “W” Model with water lubricated bearings.
Common Applications
How Pit Depth Works
Column length is measured from the bottom of the pump casing to the high water level mark just below the top bearing. That’s the deepest the liquid should sit. Measure your pit from bottom to where you want the max level, and pick the closest size. If you’re between two, go longer.
Reading the Model Numbers
Filter-Cut models follow a simple pattern: [Length Prefix][Outlet Size]
Length: SA = Short (2’6″), BA = Basic (3′), MA = Medium (4′), LA = Long (5′), XLA = Extra Long (6′), JA = 8′, KA = 10′, QA = 12′, HA = Horizontal
Outlet: 40 = 1.5″ (40mm) BSP, 50 = 2″ (50mm) BSP
So an MA50 is a Medium length (4′ / 1.22m) with a 2″ outlet.
Available Sizes
| Prefix | Imperial | Metric | Outlets |
|---|---|---|---|
| SA | 2’6″ | 0.76m | 1.5″ only |
| BA | 3′ | 0.91m | 1.5″ & 2″ |
| MA | 4′ | 1.22m | 1.5″ & 2″ |
| LA | 5′ | 1.52m | 1.5″ & 2″ |
| XLA | 6′ | 1.83m | 1.5″ & 2″ |
| JA | 8′ | 2.44m | 1.5″ & 2″ |
| KA | 10′ | 3.05m | 1.5″ & 2″ |
| QA | 12′ | 3.66m | 1.5″ & 2″ |
| HA | Horizontal | N/A | 1.5″ & 2″ |
Technical Specs
Performance
Maximum flow rate
Maximum flow rate
These figures are based on water. Thicker liquids or heavy solids content will affect performance. Give us a call and we can help you work out what you need for your specific setup.
All Models
1.5″ (40mm) Models
2″ (50mm) Models
Give us a call for pricing on any model.
Spare Parts
All genuine DUMAC parts. We keep the common ones on the shelf so you’re not waiting around. Ring us for pricing and availability.
| Part No. | Description |
|---|---|
| 40-2A / 50-2A | Pump Casing |
| 40-5A / 50-5A | Impeller (3/4″ Dia. Bore) |
| 40-4 / 50-4 | Filter Plate & Nuts |
| 50-40-12/13 | Impeller Tips & Dowels (Set) |
| 50-6A-B | Shaft 3′ (1.25″ Dia.) |
| 50-6A-M | Shaft 4′ (1.25″ Dia.) |
| 50-40-6A-L | Shaft 5′ (1.25″ Dia.) |
| 50-80A | Ceramic Seal Assembly (2) |
| 50-40-40A | Casing Bearing |
| 50-40-111A | Top Bearing |
| 50-40-103A | Bearing Housing |
| 50-40-105A | S/S Shaft Sleeve |
| 50-56 | Lube Tube – Complete Assembly |
| 50-61 | Lube Piston Assembly |
| 50-40-27 | Agitator Shaft |
| 50-40-28 | Agitator Blade & Pin |
| 50-3 | Casing Studs & Nuts (6) |
| 50-40-23 | Half Clamp |
| 50-109A | Casing Boss |
| 50-110A | Casing Boss Assembly |
This covers the most commonly needed parts. If you need something specific — a particular shaft length, or anything marked P.O.A — just get in touch and we’ll sort it out.