Line Set Coupler Kit – For All DIY Pre-Charged Systems (R-410A & R-454B)

MRCOOL DIY Coupler Kits – Seamlessly Extend Your Pre-Charged Line Sets Extend your MRCOOL mini split or central ducted HVAC system effortlessly with our MRCOOL DIY Coupler Kits. Designed to connect two pre-charged line sets together, these couplers feature MRCOOL’s patented quick connect fittings that allow refrigerant to remain sealed and stable—no vacuum pump, gauges, or certified HVAC technician required. Whether you’re working with a standard DIY mini split system or one of our advanced ducted heat pump setups, we offer the exact coupler configuration you need to get the job done right. ✅ Key Benefits of MRCOOL DIY Coupler Kits True DIY Installation: Eliminate the need for refrigerant charging or HVAC service calls—just hand tighten and go. Compatible with R-410A & R-454B: Works with both older and new-generation MRCOOL systems, including the 5th Gen DIY Series using R-454B refrigerant. No Special Tools Required: Each coupler is pre-charged, sealed, and uses quick-connect t