Welcome to D & M Manufacturing

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.

D&M Manufacturing, Inc. products are designed (Patent pending) and developed for specific security applications and all are American Made.

It is and will continue to be our goal to lead in innovation and development of security products to protect your property from the growing theft problems. Brass and Copper are increasing in value and that will contribute to the ever increasing threat to your property, damage as a result of theft, disruption to your business along with the high cost of replacement associated with the loss.

We set out to keep Sentry Products simple by designing for strength, aesthetic appearance, simple installation, and affordability. Cages simply cover the problem but do not protect it. Sentry Products lock it down, lock it up, lock a valve on or lock a valve off. You can stop the loss by taking charge today.

I encourage you to compare Sentry Products with all the others. I believe you will come to the same conclusion the majority of Property Owners/ Managers who have seen the Sentry installed agree that when it comes to protection there is only one secure choice and that is Sentry Backflow Theft Prevention Systems.

Please also view our Sentry Electrical Protection Products at (electricaltheft.com)

Thank you for considering Sentry Backflow Theft Prevention Systems for your properties.

Byron “Barney” Bishop


  • Sentry Always On Guard
  • American Made Products