SD Compressor pump with electric clutch. Sanden (Sankyo) is in the process of phasing out "R-12" style compressors. The "R-12" designation indicates that the compressors have integral 1/4" flare charge ports and male "flare" type suction and discharge connections. R-134a can be safely used in new "R-12" compressors. All Sanden (Sankyo) compressors are delivered with PAG (polyalkaline glycol) oil. PAG oil is compatible with all common refrigerants including R-12 and R-134a. No flushing is required. Key features: - Electromagnetic clutch included - All models are R-12- and R-134A-compatible. - Small size/capacity ratio. - 7cu. in displacement - with integral 1/4" charge ports ("R-12" models only) - All information is available online service/parts and manual. - Can ship at buyers expense. - Any question please email at oceanmc2@gmail.com