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A test plug for a shower drain includes a threaded portion having external threads sized to be received in an threaded aperture of a drain. An extension extends downwardly from the threaded portion to a cylindrical sealing portion which is connected to the extension below the threaded portion. The s

A test plug for a shower drain includes a threaded portion having external threads sized to be received in an threaded aperture of a drain. An extension extends downwardly from the threaded portion to a cylindrical sealing portion which is connected to the extension below the threaded portion. The sealing portion includes an elastomeric sealing ring extending circumferentially around the sealing portion. The test plug further includes a pair of alignment tabs which extending radially outward from the test plug above the elastomeric sealing ring.

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What is claimed and desired to be secured by Letters Patent is as follows: 1. A test plug for temporary installation in a drain including a body and a collar removably connectable to the body, the body having a drain bore with a cylindrical side wall, the collar including a collar aperture above an

What is claimed and desired to be secured by Letters Patent is as follows: 1. A test plug for temporary installation in a drain including a body and a collar removably connectable to the body, the body having a drain bore with a cylindrical side wall, the collar including a collar aperture above and in axial alignment with the cylindrical side wall, the collar aperture having internal threads, said test plug comprising: a) a threaded portion having external threads sized to be received in the collar aperture; and b) a sealing portion spaced downwardly from said threaded portion, said sealing portion including sealing means for sealing off the drain bore and having a diameter less than a diameter of the collar aperture so as to be insertable into the drain bore through the collar aperture. 2. The test plug as in claim 1 wherein said sealing portion is spaced from said threaded portion by a cylindrical extension. 3. The test plug as in claim 1 wherein said sealing means includes an elastomeric sealing ring. 4. The test plug as in claim 3 wherein said sealing ring is positioned on a bottom wall of said sealing portion of said test plug for sealingly engaging an annular wall of said body extending into said bore. 5. The test plug as in claim 4 wherein said bottom wall is angled downwardly from an outer edge thereof toward the center of the test plug. 6. The test plug as in claim 5 wherein said bottom wall is annular and is angled downwardly from said outer edge to an inner edge positioned radially inward of said outer edge. 7. The test plug as in claim 3 wherein said sealing ring is positioned on a circumferential surface of said sealing portion of said test plug for sealingly engaging a cylindrical side wall encircling said bore. 8. A test plug for temporary installation in a drain including a body and a collar removably connectable to the body, the body having a drain bore with a cylindrical side wall and an annular wall extending into the drain bore above the cylindrical side wall, the collar including a collar aperture above and in axial alignment with the cylindrical side wall, the collar aperture having internal threads said test plug comprising: a) a threaded portion having external threads sized to be received in the collar aperture; b) a sealing portion spaced downwardly from said threaded portion, said sealing portion including sealing means for sealing off the drain bore, said sealing means including an elastomeric sealing ring positioned on a circumferential surface of said sealing portion for sealingly engaging the cylindrical side wall; and c) an alignment tab extending radially outward from said test plug above said elastomeric sealing ring, said alignment tab positioned for engaging the annular wall of the drain and acting to align said sealing ring with the cylindrical side wall of the drain. 9. The test plug as in claim 8 wherein said alignment tab is a first alignment tab and said test plug further includes a second alignment tab extending outwardly from said test plug in a direction diametrically opposite said first alignment tab. 10. A test plug for temporary installation in a drain including a body and a collar removably connectable to the body, the body having a drain bore with a cylindrical side wall, the collar including a collar aperture above and in axial alignment with the cylindrical side wall, the collar aperture having internal threads, said test plug comprising: a) a threaded portion having external threads sized to be received in the collar aperture; b) an extension extending downwardly from said threaded portion; c) a cylindrical sealing portion connected to said extension below said threaded portion and spaced apart from said threaded portion, said sealing portion having a diameter less than a diameter of the collar aperture so as to be insertable into the drain bore through the collar aperture; and d) an elastomeric sealing ring extending circumferentially around said sealing portion for sealing engagement with the cylindrical side wall of the drain bore. 11. The test plug as in claim 10 for use in a drain which further includes an annular wall extending into the drain bore above the cylindrical side wall thereof, said test plug further including an alignment tab extending radially outward from said test plug above said elastomeric sealing ring, said alignment tab positioned for engaging the annular wall of the drain to align said sealing ring with the cylindrical side wall of the drain. 12. The test plug as in claim 11 wherein said alignment tab is a first alignment tab and said test plug further includes a second alignment tab extending outwardly from said sealing portion in a direction diametrically opposite said first alignment tab. 13. In combination, a drain and a test plug for temporary installation in said drain, said drain having a drain bore with a threaded bore portion having internal threads and a cylindrical side wall below said threaded bore portion, and said test plug comprising: a) a threaded plug portion having external threads sized to be received in said threaded bore portion of said drain; b) an extension extending downwardly from said threaded plug portion; c) a cylindrical sealing portion connected to said extension below said threaded plug portion and spaced apart from said threaded plug portion, said sealing portion having a diameter less than a diameter of said threaded bore portion so as to be insertable into said drain bore through said threaded bore portion; and d) an elastomeric sealing ring extending circumferentially around said sealing portion for sealing engagement with said cylindrical side wall of said drain bore. 14. In combination, a drain and a test plug for temporary installation in said drain, said drain having a drain bore with a threaded bore portion having internal threads, a cylindrical side wall below said threaded bore portion and an annular wall extending into said drain bore above said cylindrical wall, and said test plug comprising: a) a threaded plug portion having external threads sized to be received in said threaded bore portion of said drain; b) an extension extending downwardly from said threaded plug portion; c) a cylindrical sealing portion connected to said extension below said threaded plug portion and spaced apart from said threaded plug portion; and d) an elastomeric sealing ring extending circumferentially around said sealing portion for sealing engagement with said cylindrical side wall of said drain bore; and e) an alignment tab extending radially outward from said test plug above said elastomeric sealing ring, said alignment tab positioned for engaging said annular wall to align said sealing ring with said cylindrical side wall of said drain bore. 15. The combination as in claim 14 wherein said drain includes a channel extending downwardly through said internal threads of said threaded bore portion and said alignment tab of said test plug has a width less than a minimum width of said channel such that said test plug may be inserted into said drain bore by aligning said alignment tab with said channel and pressing said test plug into said drain bore. 16. The combination as in claim 14 wherein said cylindrical side wall of said drain bore is an internal margin of a pipe stop. 17. The combination as in claim 14 wherein said cylindrical side wall of said drain bore is relatively narrow. 18. The combination as in claim 14 wherein said alignment tab is a first alignment tab and said test plug further includes a second alignment tab extending outwardly from said sealing portion in a direction diametrically opposite said first alignment tab. 19. The combination as in claim 18 wherein said drain includes a pair of diametrically spaced channels extending downwardly through said internal threads of said threaded bore portion and said alignment tabs of said test plug each have a width less than a minimum width of said channels such that said test plug may be inserted into said drain bore by aligning said alignment tabs with said channels and pressing said test plug into said drain bore. 20. In combination, a drain and a test plug for temporary installation in the drain, the drain including a body and a collar removably connectable to said body, said body having a drain bore with a cylindrical side wall and an annular wall extending into said drain bore above said cylindrical side wall, said collar including an aperture above and in axial alignment with said drain bore, said aperture having internal threads, the threads being interrupted by a pair of diametrically spaced channels extending downwardly through said internal threads, and the test plug comprising: a) a threaded portion having external threads sized to be received in said aperture of said collar; b) an extension extending downwardly from said threaded portion; c) a cylindrical sealing portion connected to said extension below said threaded portion and spaced apart from said threaded portion, said sealing portion having a diameter selected to closely match said internal diameter of said cylindrical side wall of said drain bore; d) an elastomeric sealing ring extending circumferentially around said sealing portion for sealing engagement with said cylindrical side wall of said drain bore; and e) first and second alignment tabs extending radially outward from said test plug in diametrically opposed directions above said elastomeric sealing ring, said alignment tabs positioned for engaging said annular wall to align said sealing ring with said cylindrical side wall of said drain, each said alignment tab having a width less than a minimum width of a respective one of said channels in said threads of said collar such that said test plug may be inserted into said drain bore by aligning said alignment tabs with said channels and pressing said test plug into said drain bore. 21. The combination as in claim 20 wherein said cylindrical side wall of said drain bore is an internal margin of a pipe stop. 22. The combination as in claim 20 wherein said cylindrical side wall of said drain bore is relatively narrow.