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Mueller D-4 Hot Tap Connect to Live Lines Under Pressure

The Mueller D-4 Drilling Machine drills a hole from 5/8" to 2 1/8" in almost any size or kind of pressurized pipe. When using a service clamp and corporation valve, the D-4 machine is used to drill through the pipe to activate the service.

A combined feed nut and yoke provides positive feed for the drill travel, and makes it possible to disengage the feed to permit the drill to be positioned quickly. A special mechanism on the feed yoke locks the drill to the yoke to prevent the drill from spiraling into the hole prematurely.

Maximum working pressure is 500 psig at 100F or 250 psig at 375F.

If you're unfamiliar with the Mueller D-4, you may want to read the Mueller D-4 Manual, and a better illustration of how it all works in the Mueller factory brochure.


Manufactured by Mueller Company in the USA
Model D-4
No serial number visible
Drills and taps in almost any kind of pressurized pipes between 1/8" to 2 1/8"
14" length of travel
Hand-operated with a ratchet wrench
Includes Mueller 36196, 37902 and 37903 cutter arbors
Includes 11/16", 15/16" and 1 7/16" pilot drills along with an extra 11/16" bit
Includes Mueller ratchet and handle extension

CA Inventory # 6303  

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  • Cavlon Item No. 6303
  • Model: D-4
  • Shipping Weight: 93lbs
  • 0 Units in Stock

This product was added to our catalog on Thursday 16 July, 2015.

Please contact us at (505) 227-7709 or email

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