D / BLUE / R Proportional dosing units with by-pass and adjustable connections with swivel shanks Proportional powder polyphosphate or cylindrical dosing units with adjustable connections (90 ° steps rotation), built-in faucet by-pass on the head in chromed brass, brass retaining ring, front bleed screw. The attacks are equipped with nr. 2 shanks with antibacterial-Bios system. A cartridge charge of polyphosphates is included.