Danfoss LENO MSV-BD + MSV-S DN 20 — matched pair of manual balancing valves for the supply and return of a hydronic heating or cooling circuit. The MSV-BD is the double-regulating and measuring valve (lockable presetting on a graduated scale with two self-sealing test plugs for differential-pressure/flow commissioning and a drain); the MSV-S is the shut-off partner valve. DZR brass body, PN 20, internal thread G ¾", Kvs 6 m³/h, media temperature -20 °C to 120 °C, differential-pressure range 3 KPa–250 KPa. OEM P/N 003Z4052. EAN 5702420096971. Technical data quoted verbatim from store.danfoss.com (code 003Z4052).