Overall dimensions and technical information are provided solely for informative purposes and may be modified without notice AIR TREATMENT Modular FRL Series Airplus Dimensions D1 D2 L3 L4 L2 B1 B3 B2 D3 Pressure gauge connection port version (B) Model B1 B2 B3 D1 D2 D3 L2 L3 L4 B version M version #171.. 48 24 42 48,5 G1/4” G1/8” 1/4” NPT G1/8” M30x1,5 27,5 54 55 B3 B2 D2 D1 Integrated pressure gauge version (M) 47