Block(TM) - Screw Cap With Brush

Great stuff, this is what you want when putting plumbing together.

Works good for gas pipe

i USED THIS IN MY HEATING BUSINESS FOR ALL MY THREADED PIPE CONNECTIONS FOR 24 YEARS AND THEN SOME AFTERWARDS. sOMEONE OUGHT TO TELL lOWES AND hOME dEPOT WHAT REALLY WORKS.