Fluid isolation assembly for etching inner surface of pipe end

A device for isolating a flow of fluid inside an open end of a pipe, the device comprising:

• a flow tube positioned along a longitudinal axis of the device, the flow tube having an open first end, a closed second end, an inner longitudinal bore, and a plurality of apertures adjacent the second end, wherein the closed second end of the flow tube comprises a stop plate configured to fit within the pipe;
• a support cage comprising a top flow plate axially spaced apart from a bottom flow plate, and three or more longitudinal supports connected therebetween, wherein the supports are radially spaced about the longitudinal axis of the device and set apart from the flow tube, wherein each of the top and bottom flow plates include radially positioned apertures;
• a compression nut threadedly connectable over a locking knob and configured to be positioned over the open end of the pipe;
• a cap adjacent the open first end of the inner flow tube and having a fluid outlet;
• and
• an anchor nut threadedly connectable about an outer circumference of the flow tube and adjacent to the open first end thereof,
• wherein each of the compression nut and cap include flow channels in fluid communication with the apertures in the top flow plate, and which provide fluid communication with the fluid outlet,
• wherein, when the device is inserted into the open end of the pipe:
• (i) threadedly connecting the locking knob onto the compression nut compresses an outer gasket positioned therebetween, thus sealing the device about an outer circumference of the open end of the pipe, and
• (ii) threadedly connecting the anchor nut onto the flow tube pulls the stop plate toward the anchor nut such that an inner gasket positioned between the stop plate and the bottom flow plate is compressed and seals against an inner surface of the pipe.