The MARS 12789 is a heavy-duty 45/7

Enhanced Reliability: Permanent Split Capacitor (PSC) design paired with direct drive coupling reduces mechanical failure points compared to belt-driven alternatives

2-inch NPT threaded globe valve assembly designed for precise modulation in high-demand HVACR systems

verify your HVAC electrical schematics to ensure correct pin alignment and ground continuity

and springs required for a complete top-to-bottom teardown

Trane VAL9185 TXV 323055-751 The MARS 12789 is aFor veteran technicians servicing high capacity 5 ton systems, the Trane VAL9185 TXV is the standard OEM replacement for maintaining tight superheat control. This genuine Trane VAL09185 Thermostatic Expansion Valve is designed for R410A refrigerant and features field proven brazed ODF connections (3 8" inlet by 1 2" outlet) to ensure a leak free seal in high pressure air handler applications. As a balanced port valve manufactured by Sporlan for Trane,