the construction site inserted through an opening in the roof deck 60 and deck framing 62 the connector outlet port 38 is press fitted into the receiving end 42 of a plumbing industry standard drain pipe 40 to complete the installation the perimeter of the boot flange 22 is overlapped onto to the single layer synthetic membrane 70 and a seal 72 formed between the boot flange 22 and the membrane 70 the seal 72 may be formed by heat welding or other methods used for joining sheets of the synthetic membrane during installation of the single layer synthetic membrane 70 the seal 72 must be formed along the entire perimeter of the boot flange 22 the width of the seal 72 will be determined by the method of sealing but in no case less than one inch wide regardless of sealing method to facilitate cleaning the drain a second embodiment 10a that includes a hub 50 is shown in fig4 like parts to those shown in fig1 and 3 are similarly numbered with the addition of a suffix 34 a 34 the hub 50 has a longitudinal passageway 52 with a connection inlet 56 for receiving a removable grate collar 16a and a connection outlet 59 at the opposite end of the longitudinal passageway 52 preferably the longitudinal passageway 52 has at least one variation in the bore 39 s diameter forming a stop 54 the hub 50 is preferably at least two inches in length with the connection inlet 56.