Description APT flexible entry boots are two-piece boots that double the sealing power of your entry boots. Stainless steel studs and corrosion resistant nuts and backing rings make for the highest quality entry boot. Franklin Fueling Systems offers a complete line of sizes for single and secondary containment pipe. Also available in a ducted boot version to accommodate the use of APT DCT-400 corrugated ducting for easy retractability. The Franklin Fueling Systems (APT) FEB-075-D is a flexible entry boot for 3/4" and 1" electrical conduit.