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Foam Branch Pipe Application The Persian GPE series of low expansion foam branch pipe has been designed with long range performance in mind. There are three basic models with nominal foam solution throughputs of 225, 450 and 900 liters/mm at 7 bar. Self- inducing models are available in the 225 and 450 liters/minute versions. All models produce finished foams of nominal expansion 10 : 1 and give foam streams of an exceptional range. To get the best results from these branch pipes we recommend use with either FP70 Plus Fluor protein foam or Alco seal AR-FFFP multi-purpose foam concentrate. Foam concentrate is drawn through a pick up tube at a present foam concentrate amount and is added into the water stream. The controller body is clearly marked with a flow direction arrow and label to identify the type of foam concentrate and injection percentage ratio.