The Hongsen HS-MH-1234 is a refrigerant recovery machine specifically designed to handle R-1234yf, a more environmentally friendly refrigerant that is part of the hydrofluoroolefin (HFO) family. This refrigerant is gaining popularity as a replacement for older refrigerants like R-134a due to its lower global warming potential. https://www.industrywaala.com/product/hongsen-taa0651-hs-mh-1234-lock-type-r1234yf-quick-coupler-h-female-with-adapter