They have a litre scale and a black screw cap

BM is an encapsulated submersible pump that is suitable for applications where a high pressure is required

5-16 AR-PV/T/C-F-31I001F The SMART Digital DDA is a compact positive displacement

DDA 12-10 FCM-PVC/E/C-F-31U2U2 The SMART Digital DDA is a compact positive displacement

DDA 12-10 AR-SS/T/SS-F-31AAFG The SMART Digital DDA is a compact positive displacement

pressure relief valves 95730784 They have a litre scalePressure relief valves protect the pump in case of too high counterpressure. They are installed in the discharge line near the pump, using the 2 in line connections. The side connection leads the relief liquid back into the tank.