| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
| Manhattan Tubs/Showers |  |
Maxstraps | McGuire Manufacturing | |
| Metaflex | |
Milliken Plug Cocks | Milwaukee Tools | |
| Mission Couplings | Modine Manufacturing | Monitor Boiler | ||
| Mountain Products | Mr. Steam | Mueller | ||
| Murray SS Clamps | Mustee & Sons, Inc. | Myers | ||
| Myson, Inc. | ||||
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