Tuxing TXES031 300bar pcp compressor with cooper serpentine mod pumping FX Maverick with 400cc from 140 to 260 bar after the mod for 1:50 and max temp of the serpentine is 25C not 82C like with the original pipe between stage 1 and 2. With this mod the air from stage 1 is much colder when go to stage 2 and this reduce the time for pumping,,reduce the condensations ,reduce also the teperature of the head and extend the life of the compressor. The pipe is cooper,diameter 6mm, ticknes 1mm, 12 windings with diameter 40mm. Only the first 4 windings on bottom is hot,the pipe on top is super cold.