The Dust Muzzle Ultra

The Dust Muzzle Ultra


(Part# DMU5, Part# DMU8)

• The Most Affordable Universal Dust Muzzle
• DMU5 fits all 4″-5″ Grinders
• DMU8 fits all 7″-9″ Grinders

The Dust Muzzle Ultra comes in two sizes. The DMU5 fits all 4″-5″ grinders and the DMU8 fits all 7″-8″ grinders. When the Dust Muzzle Ultra is connected to a 2hp industrial vacuum it is the most efficient and durable Dust Muzzle available for right angle grinders.

Do not use a Dust Muzzle for 7-9″ grinders with bearing housing diameters less than 2.25″. Use the Original Dust Muzzle.

Video Installation Instructions

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The Most Affordable Universal Dust Muzzle
Fits all 4″-5″ & 7″-8″ Grinders
Flexible • Transparent • Lightweight
For over 1200 Electric and Pneumatic Angle Sanders
Made From Rugged Polypropylene • Flexible down to -20 Degrees
Installs in Minutes • Up to 99% Efficient
Excellent for Wet-or Dry Grinding and Polishing

The Dust Muzzle Ultra is based on the design of the original Dust Muzzle and is the most efficient design available for right angle sanders. The side-mounted vacuum pickup uses the centrifugal forces created by the grinding wheel to send the pollutants out the exhaust port. This method requires much less vacuum power than top mounted designs.

The Dust Muzzle Ultra is connected to your industrial 2hp vacuum by a lightweight step-down hose for ease of motion. If the operator does not have a step-down hose, he will need one to connect the Dust Muzzle to the 1 1/2″ hose that comes standard with all American vacuums.

How the Dust Muzzle Ultra works
Like the Original Dust Muzzle, the Dust Muzzle Ultra uses the centrifugal forces created by the grinding wheel to force the dust out the side exhaust port. This design requires much less vacuum power than dust collectors with the exhaust port mounted on top of the housing. When connected to a standard 2hp industrial vacuum, the Dust Muzzle Ultra can remove up to 99% of the pollutants at the point of origin.

The Dust Muzzle Ultra uses an adjustable collar, spacer washers and a set of flexible adapter rings to accommodate the entire range of collar diameters and grinding wheel configurations for both the 4″-5″ grinders and the 7″-9″ grinders.

The main difference between the many brands of grinders is the diameter of the bearing housing. This is where all dust collectors are attached. On 7″-8″ grinders, the bearing housings can vary in diameter from 1.75″ to over 3″. On the 4″-5″ grinders, the bearing housings will vary from 1.5″ to over 2″.

Dust collectors using the flexible collar design similar to the Dust Muzzle Ultra are not able to accommodate all the different diameters of bearing housings. They tend to “pinch off” the hose clamp when they are required to compress the adjustable collar to the smaller diameter bearing housings.

Figure 1. The hose clamp is being pinched off the flexible collar. This happens when the flexibility of the collar cannot accommodate the smaller diameter bearing housings.

The Dust Muzzle Ultra has solved this problem. The flexible adapter ring of the Dust Muzzle Ultra makes up for the differences in these bearing housings.

OSHA 2017 Silica Dust Requirements specify a HEPA vacuum with 110 CFM for diamond wheels 4 1/2″ in diameter and 175 CFM for diamond wheels 7″ in diameter.
To be compliant, the contractor will need vacuums with the following specs.
110CFM Vacuum System   220 CFM Vacuum System

The Dust Muzzle Ultra is excellent for grinding fiberglass, concrete, wood, paints and epoxies. It can be used with sandpaper, diamond cup wheels, wet-or-dry polishing pads and soft pad discs.

Note: When the Dust Muzzle Ultra is being used with a 7″ sanding disc, a Zec™ wheel or any other wheel that is less than 3/8″ from top to bottom, it is recommended that the operator purchase an arbor extender so the wheel will position itself correctly in the Dust Muzzle.

Fits all pneumatic and electric grinders using discs from 4″ to 8″ in diameter
Excellent for diamond cup wheels
Can be used wet-or-dry and for polishing pads
Works well with sanding discs, silica carbide wheels and soft pad sanders
Adapts for cutting, crack chasing and tuck pointing with 4″-5″ diamond blades
Up to 99% efficient when used with a 2hp industrial vacuum system

Brand Model Original
7″ Sanding
Discs or Zec
7″ Diamond Cup Wheels and 8″
Soft pads
BLACK & DECKER 4049 720 820
BLACK & DECKER 4042 718 818
BLACK & DECKER 4052 720 820
BLACK & DECKER 4074 720 820
BLACK & DECKER 4075 720 820
BLACK & DECKER 4076 720 820
BLACK & DECKER 4252 720 820
BLACK & DECKER 4255 720 820
BLACK & DECKER 6112 720 820
BLACK & DECKER 6124 720 820
BLACK & DECKER 6128 720 820
BLACK & DECKER 9513 718 818
DEWALT 493 720 820
DEWALT 494 720 820
DEWALT 845 720 820
DEWALT 847 720 820
DEWALT 849 720 820
DEWALT 949 720 820
HITACHI G13SC2 720 820
HITACHI G18SR 720 820
HITACHI SAT180 720 820
HITACHI SP18SA 720 820
HITACHI SP18T 718 818
HITACHI SP18V 720 820
MAKITA 9607BL 720 820
MAKITA 9609B 720 820
MAKITA GA7001L 720 820
MAKITA GA7911 720 820
METABO 11050 (6″) 720 820
METABO W14-150 (6″) 720 820
METABO WE 14-150 (6″) 720 820
METABO AG65OSL 720 820
METABO AG65OVS 720 820
METABO PE12-175 720 820
RYOBI SP1800A 720+ 820+
SEARS 315.11571 718 818
SEARS 315.115041 718 818
SEARS 900 729 DMU8
SEARS 9″ S/G 718 818

Photo Gallery

The flexible adapter ring increases the diameter of the bearing housing so “pinch off” is not a problem.

For larger diameter bearing housings such as the ones on the Bosch and Milwaukee grinders, no adapter ring is needed.

The flexible adapter ring being stretched over the bearing housing of a Makita grinder.

Grinders with smaller bearing housings such as the DeWalt, Makita and others, may need to use the flexible adapter ring to increase the diameter of the bearing housing to avoid hose clamp pinch-off. The adjustable collar is placed over the flexible adapter ring and secured to the bearing housing with a hose clamp.

The flexible ring bites into the annular groove in the bearing housing of the grinder to form a secure bond between the Dust Muzzle and the grinder.

The Dust Muzzle Ultra on a 5″ DeWalt Grinder

The Dust Muzzle on a 7″-8″ Bosch Grinder

The Dust Muzzle Ultra on a 4 1/2″ Milwaukee Grinder

The Dust Muzzle on a DeWalt 4 1/2″

The Dust Muzzle Ultra on a 4 1/2″ Makita Grinder


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