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Step 4The Plug
To make the drain hole I heated and flared out the end of the 1/2" PVC drain pipe. I did that by heating it over a gas stove to soften it and pressing it over a ball peen hammer. When the plastic cooled, the end had a tapering hole, ideal for receiving a rubber plug.
The plug is made of silicone rubber. As a mold for it, I used the actual drain pipe. I packed a wad of aluminum foil in the hole to form the bottom of the plug, and coated the foil and the pipe with a mold release agent, such as dish detergent, or Vaseline jelly.
I filled the space in the mold with clear silicone rubber from the hardware store. While it was fresh, I made a loop of nylon string, knotted it, and embedded the frayed ends of the strings in the silicone. The string is firmly held and can be used for pulling out the plug.
With that much silicone, it took about a day to harden up completely. It's a good plug and doesn't leak.
The plug is made of silicone rubber. As a mold for it, I used the actual drain pipe. I packed a wad of aluminum foil in the hole to form the bottom of the plug, and coated the foil and the pipe with a mold release agent, such as dish detergent, or Vaseline jelly.
I filled the space in the mold with clear silicone rubber from the hardware store. While it was fresh, I made a loop of nylon string, knotted it, and embedded the frayed ends of the strings in the silicone. The string is firmly held and can be used for pulling out the plug.
With that much silicone, it took about a day to harden up completely. It's a good plug and doesn't leak.
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