The Control Circuit Adaptor 95303335 connects the control oil circuit to the valve group in HC25 Hydraulic Rock Drills, ensuring stable transmission of control signals. Generic adaptors have narrow oil channels that clog easily with debris, disrupting control. This OEM adaptor has a large-diameter (≥8mm) oil channel with a smooth inner surface (Ra≤0.6μm) to prevent clogging. It is made from high-strength steel (tensile ≥650MPa) to handle system pressure, maintaining reliable signal transmission until cracking or port wear requires replacement.