The 1312100198 discharge line is a copper pipe rated for high temperatures. This discharge line was used on a wide variety of piston compressors manufactured by BelAir, Chicago Pneumatic and NAPA.
On most models this line goes from the outlet of the piston compressor pump to the inlet of the receiver tank / check valve. This is a copper line that connects via compression fittings.
This part number may be displayed in your manual as 1312 1001 98 or 1312-1001-98
This copper discharge line is used on the following Chicago Pneumatic compressors:
Part #: 1312100171
Part #: 1312100570
Part #: 1312100611
Part #: 1312100706
Part #: 1312101102