Danfoss AF-range impulse tube set (OEM designation "Impulse tubes for AFPQ4 PN16 DN250"). The impulse tubes connect the diaphragm chamber of a Danfoss self-acting AF-range pressure/flow controller actuator to the pressure-sensing tapping(s) on the pipework, transmitting the pipe pressure to the actuator so it can hold the set differential pressure or flow. This set is matched to the AFPQ4 controller on valve size DN 250 at PN 16. Tube outer diameter 10 mm; union connection G 1/4; material Stainless steel. Permissible medium: District heating/cooling circulation water. OEM P/N 003G1419. EAN 5710104043227. Technical data quoted verbatim from store.danfoss.com (code 003G1419).