Which of the illustrated valves is used to gain access to a hermetic system not fitted with service valves or access fittings by means of piercing the refrigeration system tubing? See illustration GS-RA-69.
• Hermetic refrigeration system means the compressor and piping are sealed with no built‑in service ports • A piercing or line‑tap valve clamps on existing tubing and has a sharp stem that punctures the line • Compare shapes: clamp‑on body vs. inline service valves or brazed‑in access fittings
• Which illustration shows a device that could be installed on existing smooth tubing without cutting the line first? • Which valve clearly has a body designed to clamp around a pipe and be tightened with screws so a needle can puncture the wall? • Which other options look like they require the tubing to be cut and flared or brazed in, instead of pierced in place?
• Identify the one that has a two‑piece clamp body with bolts or screws to grip the tubing • Make sure the valve has a projecting outlet where you would connect your service hose or gauge manifold • Eliminate any valves that obviously need flared or brazed connections rather than a clamp‑on, self‑piercing design
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