The newly designed caps are mechanically sealed to dual beads on the Uniboot aluminum base and grooves on the inside of the EPDM cap.
The new drain you sent me home with worked perfectly and even though I wasn't a seasoned roofer, I was still able to put it in in six minutes. Thank everyone that helped me, you guys were a tremendous help and looking forward to doing business with you and your company soon.
— Brian, Maintenance, Buffalo, NY