Welcome to D & M Manufacturing

American-Made Security. Built on Integrity.

D&M Manufacturing, Inc. products are designed and developed for specific security applications, and all are proudly American Made.

It is our goal to lead the industry in innovation to protect your property from growing theft problems. As the value of Brass and Copper rises, so does the threat to your business. Theft doesn’t just cost you the price of replacement—it causes massive water damage, business disruption, and safety hazards.

The Sentry Difference We set out to keep Sentry Products simple by designing for strength, aesthetics, and ease of installation. Standard cages simply cover the problem. Sentry Products lock it down.

  • Lock it Down: Anchoring directly to the concrete.

  • Lock it Up: Encasing vital components in heavy-duty steel.

  • Lock it Off: Preventing unauthorized valve operation.

I encourage you to compare Sentry Products with all others. The majority of Property Owners and Managers agree: there is only one secure choice, and that is Sentry Backflow Theft Prevention Systems.

In Memoriam D&M Manufacturing, Inc. was founded in memory of Dean Adam Shepherd, our beloved Grandson, and to the Glory of our God and Savior Jesus Christ. A glorious reunion awaits us that we shall not miss.

View Our Full Catalog Please explore our full line of security solutions, including our newly integrated Electrical Protection Products, via the menu above.

Thank you for considering Sentry for your properties.

Byron “Barney” Bishop President

  • American Made Products