New York City Refrigeration License Exam Preparation 2026

The main idea is that fittings used on manifold hoses are designed to keep refrigerant from escaping when you connect or disconnect the hoses. Low loss fittings have a built-in sealing mechanism that closes off the refrigerant path as you detach the hose, so only a tiny amount (often virtually none) escapes. This design keeps more refrigerant in the system and reduces waste and the need for further recovery.

Expandable hoses change length but don’t specifically address sealing during disconnection, so they don’t reduce loss. Rigid steel fittings are sturdy but lack the quick-seal feature that minimizes venting. Non-return valves prevent flow in one direction, but they don’t tackle the issue of minimizing refrigerant loss during hose disconnection.