We use a quick disconnect T fitting after our pump and we use a line with a check valve to bubble the hot vapor from the bottom. We use the same line for hot vapor loop anywhere on the system we just shut off the valve on the solvent tank so the hot vapor goes where ever the line is connected . Our material columns (6x48)have a bypass line and crc line with a 6" dutch weave sintered disc . I put all the oil in the column bottom fill first with solvent so the first thing to hit the sintered disc is clean solvent then top fill the column to 80% fill . Start pushing through your crc until you have enough solvent in your collection for a decent hot loop . Connect the hot vapor line to the bottom of the column so the hot vapor agitates and dissolves the oil and with the ball valves cracked just right only dissolved oil will push through into the crc. You can even use a 6" sight class to visually see it happen but i typically don’t. This tech works great for washing and dissolving thca as well . I have done runs on the 250L system with no nitrogen using this the hot vapor loop and still running cold