I need a replacement low pressure AC line for my AP1 s2k. Is an AC receiver pipe or AC suction pipe the same thing as the low pressure line?

 

Yes but I made a mistake, the hose that leaks is the one that goes from the compressor to the condenser which is a high pressure line IE a discharge hose. My apologies.

 

So is the suction pipe the same thing as the low pressure line?

 

Yes, that is the line from the evaporator to the compressor. Its called the suction side because it's drawing in the refrigerant as a gas. Compressing(hence the name compressor) it and sending it as a liquid to the condenser. Condenser removes heat from the compression process, then the liquid passes through the drier canister into the expansion valve which meters refrigerant into the evaporator, and the cycle starts over.