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A coupling assembly for inserting into and coupling with the end of an open pipe, such as a cleanout pipe used in plumbing systems and wherein the coupling assembly may be used as a plug. The coupling assembly includes a collar secured around a medial portion of the cylindrical body of reduced diame

A coupling assembly for inserting into and coupling with the end of an open pipe, such as a cleanout pipe used in plumbing systems and wherein the coupling assembly may be used as a plug. The coupling assembly includes a collar secured around a medial portion of the cylindrical body of reduced diameter. The collar is driven downward by threadable advancement of a plurality of screws for squeezing a seal against the collar and a downwardly and outwardly projecting shoulder which causes the seal to expand outward to seal against the inner wall of the pipe. The screws simultaneously bite into the inner wall of the pipe to help secure the coupling assembly in place.

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Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is as follows: 1. A coupling assembly securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said coupling assembly comprising: a cylindrical body including an upp

Having thus described the invention, what is claimed as new and desired to be secured by Letters Patent is as follows: 1. A coupling assembly securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said coupling assembly comprising: a cylindrical body including an upper portion a medial portion and a shoulder; said medial portion extending below said upper portion and having an outer diameter that is smaller than an outer diameter of said upper portion; said shoulder extending below and projecting outward from said medial portion, said upper portion having a plurality of channels formed therein and extending from an upper end to a lower end of said upper portion; a pliable seal disposed around said medial portion upward of said shoulder; a collar disposed around said cylindrical body above said seal said collar having a lower surface positioned proximate said seal, a screw threadingly advanceable through each of said channels of said upper portion of said cylindrical body and engageable with an upper surface of said collar, each said screw threadingly advanceable downward to push said collar downward and against said seal; and wherein a bore extends into said cylindrical body from a lower end thereof. 2. The coupling assembly as in claim 1 wherein an upper end of said bore is closed by a closure member extending thereacross and connected to said cylindrical body. 3. The coupling assembly as in claim 2 wherein said closure member is positioned at an upper end of said cylindrical body. 4. A coupling assembly securable in the open end of a pipe having a bore defined by a cylindrical inner wall said coupling assembly comprising: a cylindrical body including an upper portion a medial portion and a shoulder; said medial portion extending below said upper portion and having an outer diameter that is smaller than an outer diameter of said upper portion; said shoulder extending below and projecting outward from said medial portion, said upper portion having a plurality of channels formed therein and extending from an upper end to a lower end of said upper portion; a pliable seal disposed around said medial portion upward of said shoulder; a collar disposed around said cylindrical body above said seal said collar having a lower surface positioned proximate said seal, a screw threadingly advanceable through each of said channels of said upper portion of said cylindrical body and engageable with an upper surface of said collar, each said screw threadingly advanceable downward to push said collar downward and against said seal; and a flange projecting radially outward from said upper portion of said cylindrical body. 5. The coupling assembly as in claim 4 wherein said shoulder slopes outward and downward from said medial portion. 6. The coupling assembly as in claim 5 wherein an outer diameter of said shoulder does not exceed an outer diameter of said upper portion of said cylindrical body. 7. The coupling assembly of claim 4, wherein one or more of said screws threadingly engage the inner wall of the pipe when threadingly advanced to engage an upper surface of said collar. 8. A coupling assembly securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said coupling assembly comprising: a cylindrical body including an upper portion a medial portion and a shoulder; said medial portion extending below said upper portion and having an outer diameter that is smaller than an outer diameter of said upper portion; said shoulder extending below and projecting outward from said medial portion, a seal encircling said medial portion of said cylindrical body at a position proximate said shoulder, a compression collar encircling said medial portion of said cylindrical body above and proximate said seal, means for moving said compression collar downward to engage said seal and compress said seal between said compression collar and said shoulder to outwardly deform said seal; and wherein a bore extends into said cylindrical body from a lower end thereof. 9. The coupling assembly as in claim 8 wherein an upper end of said bore is closed by a closure member extending thereacross and connected to said cylindrical body. 10. The coupling assembly as in claim 9 wherein said closure member is positioned at an upper end of said cylindrical body. 11. A coupling assembly securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said coupling assembly comprising: a cylindrical body including an upper portion a medial portion and a shoulder; said medial portion extending below said upper portion and having an outer diameter that is smaller than an outer diameter of said upper portion; said shoulder extending below and projecting outward from said medial portion, a seal encircling said medial portion of said cylindrical body at a position proximate said shoulder, a compression collar encircling said medial portion of said cylindrical body above and proximate said seal, means for moving said compression collar downward to engage said seal and compress said seal between said compression collar and said shoulder to outwardly deform said seal, and a flange projecting radially outward from said upper portion of said cylindrical body. 12. The coupling assembly as in claim 11 wherein said shoulder slopes outward and downward from said medial portion. 13. A coupling assembly securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said coupling assembly comprising: a cylindrical body including an upper portion and a medial portion extending below said upper portion of said cylindrical body and having an outer diameter which is smaller than an outer diameter of said upper portion, said cylindrical body further including a shoulder projecting downward and outward from a lower end of said medial portion; a peripheral flange formed at said upper end of said cylindrical body upper portion and projecting radially outward therefrom; said upper portion of said cylindrical body having a plurality of screw receiving grooves formed in an outer surface thereof; a pliable, annular seal disposed around said cylindrical body adjacent said lower portion of said cylindrical body; a collar disposed around said medial portion of said cylindrical body above said seal and having a lower surface adjacent said seal; a screw threadingly advanceable through each of said screw receiving grooves in said cylindrical body, a lower end of each screw adavanceable into engagement with an upper edge of said collar for driving said collar downward against said seal, squeezing said seal against said lower portion and causing said seal to protrude radially outward. 14. The coupling assembly as in claim 13 wherein each said screw has an external thread which is larger in diameter than said associated screw receiving groove in said cylindrical body. 15. The coupling assembly as in claim 14 wherein the upper portion of the cylindrical body is sized relative to the pipe such that when each said screw is driven into the associated screw receiving groove said thread of each screw bites into said cylindrical body adjacent said groove and into the inner wall of the pipe. 16. The coupling assembly as in of claim 13, wherein a bore extends into said cylindrical body from a lower end thereof. 17. The coupling assembly as in claim 16 wherein an upper end of said bore is closed by a closure member extending thereacross and connected to said cylindrical body. 18. The coupling assembly as in claim 17 wherein said closure member is positioned at an upper end of said cylindrical body. 19. A pipe plug securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said pipe plug comprising: a cylindrical body having a shoulder projecting downward and outward from a lower end thereof; a mounting flange projecting outward from an upper portion of said cylindrical body for engagement with an end of a pipe into which said pipe plug is to be secured; a pliable, annular seal disposed around said cylindrical body above said shoulder; a collar disposed around said cylindrical body above said seal; a plurality of screws each threadingly advanceable through a screw receiving groove in said cylindrical body, a lower end of each said screw advanceable into engagement with an upper edge of said collar for driving said collar downward against said seal, pressing said seal against said shoulder and causing said seal to protrude radially outward. 20. A pipe plug securable in the open end of a pipe having a bore defined by a cylindrical inner wall, said pipe plug comprising: a cylindrical body having a shoulder projecting downward and outward from a lower end thereof; a mounting flange projecting outward from an upper portion of said cylindrical body for engagement with an end of a pipe into which said pipe plug is to be secured; a pliable, annular seal disposed around said cylindrical body above said shoulder; a collar disposed around said cylindrical body above said seal; a plurality of screws each extending through a hole in said flange and threadingly advanceable into engagement with an upper edge of said collar for driving said collar downward against said seal, pressing said seal against said shoulder and causing said seal to protrude radially outward.