Not required for iron pipes or polyethylene pipes. An internal thread connection is not suitable for a pipe threaded socket or even a pipe. I got it working using JB Weld to weld two 3/4" to 1/2" sockets. The instructions state that this device is intended for welding PPR pipes and hot melt adhesive. The instructions say "but if the whistle in your family is made of metal, then the whistle must be accepted differently". God thank you for telling me now! If the metal in the filter was brass, the bushings could be soldered. Thank goodness for JB Weld. That's the only way I could get it to work.
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