Check the listing for details. CPS TR21 Compressor Part TR21X4 CPS TR21 Oilless Compressor Head Assembly. Condition: New. Listed at 196.65 USD. Gregoriou Brothers Refrigeration Since 1979Frosty-Freeze CPS TR21 Compressor Part TR21X4 CPS TR21 Oilless Compressor Head Assembly CPSTR21X4 CPS TR21 Oiless Compressor Rebuild KitTR21X4 CPS TR21 Oiless Compressor Rebuild Kit.TR21X4 CPS TR21 Oilless Compressor Head Assembly. Includes valves and pressure switch assembled ready to install.The 3rd picture shows the recovery unit (TR21) that this kit is used on. $CPSTR21X4 CPS TR21 Oiless Compressor Rebuild Kit TR21X4 CPS TR21 Oiless Compressor Rebuild Kit. TR21X4 CPS TR21 Oilless Compressor Head Assembly. Includes valves and pressure switch assembled ready to install. The 3rd picture shows the recovery unit (TR21) that this kit is used on. Gregoriou Brothers Refrigeration Since 1979Frosty-Freeze CPS TR21 Compressor Part TR21X4 CPS TR21 Oilless Compressor Head Assembly CPSTR21X4 CPS TR21 Oiless Compressor Rebuild KitTR21X4 CPS TR21 Oiless Compressor Rebuild Kit.TR21X4 CPS TR21 Oilless Compressor Head Assembly. Includes valves and pressure switch assembled ready to install.The 3rd picture shows the recovery unit (TR21) that this kit is used on. CPSTR21X4 CPS TR21 Oiless Compressor Rebuild KitTR21X4 CPS TR21 Oiless Compressor Rebuild Kit.TR21X4 CPS TR21 Oilless Compressor Head Assembly. Includes valves and pressure switch assembled ready to install.The 3rd picture shows the recovery unit (TR21) that this kit is used on.