The Plastic DP03 and DP03/X are not recommended for new designs, as they can be replaced by the metal door stations DS01 and DS02, see http://www.comfortforums.com/forum68/1404.html
The plastic door stations are not very water-resistant and need to be sheltered in contrast to the DS01 and DS02. Also the performance for intercom accoustic isolation for the DS01 and DS02 are better than DP03. Hence it is recommended that DS01 or DS02 be used for new installations
The plastic door stations are not very water-resistant and need to be sheltered in contrast to the DS01 and DS02. Also the performance for intercom accoustic isolation for the DS01 and DS02 are better than DP03. Hence it is recommended that DS01 or DS02 be used for new installations