GEORG FISCHER 20 MM (DN20), TYPE 546 PRO EPDM BALL VALVE, PVC-U, LOCKABLE

If you want a solid product these are it.

The 20 mm Type 546 Pro ball valve is easy to install, durable and comes with 20mm screw in fittings , including integration with actuators and sensors, commonly utilised in high value water and wastewater treatment related applications.