ASSE 1017|Buy American Act Compliant|California HSC 116875|CSA B125.3|UPC Certified|IPC Listed|IRC Listed|Maryland HB372|NPC Certified|NSF/ANSI/CAN 372|Unites States S.3874|Vermont Act 193

• Large mixing chamber and thermostatic cartridge - enables precise mixed temperature stability during inlet temperature and pressure variations Installation flexibility - 1/2 to 1 in sweat, NPT, press, PEX crimp and PEX expansion union connections Anti-scale polymer materials - inhibits scaling on internal sliding surfaces, assuring stable temperature control and long life Tamper-proof adjustment setting lock - prevents tampering of the mixed water temperature set point Posi-Stop™ union seal and internal O-ring seals - stands up to treated water, chlorine or chloramines Precisely manufactured - finely machined threads and double O-rings for smooth knob adjustment

The Caleffi MixCal™ 521 series three-way thermostatic mixing valve is used in systems producing domestic hot water or in hydronic and radiant heating systems. It maintains the desired output temperature of the mixed water supplied at a constant set value compensating for both temperature and pressure fluctuations of the incoming hot and cold water. The MixCal™ thermostatic mixing valve is ICC-ES certified to ASSE 1017 and CSA B125.3. It complies with codes IPC, IRC, NPC and UPC for use in accordance with the US and Canadian plumbing codes and standard NSF/ANSI/CAN 372, low-lead. Caleffi code 290030 full-port ball valve is designed for isolating the MixCal™ 521 series that has 1 in metric "G" thread union connections. The isolation valve installs in between the valve body and the tailpiece fitting assembly. Male x female configuration and bi-directional full ball valve flow capacity provides flexibility for using one or two isolation valves for the primary functioning valve. An optional stem extension is also available for those projects that require pipe insulation.