Intrasonic RETROMTP Intercom Upgrade Master Station Update Plate
The RETRO-MTP Master Trim Plate gives you the ability to install the new RETRO-M master unit into the existing rough-in. The Trim Plate is used to eliminate the need for dry wall repair in most cases. You are able to replace the existing intercom master without removing the existing rough-in box in most cases.
Dimensions: 18-3/4" W x 10"H