These Single Pass Coolers are designed to be used as Engine or Transmission Oil Coolers. Available with 1/4", 3/8", or 1/2"  female NPT ports on each end.

P/N     1201            12" long
P/N     1801            18" long
P/N     2401            24" long
P/N     3001            30" long
P/N     3601            36" long
P/N     4201            42" long