I had a 1/4" tank nipple break of at the reducer bushing coming off the pressure switch. Hoping to be able to free that broken nipple with some penetrating oil and a pipe nipple extractor. If it fails my next guess would be to remove the reducer bushing and install new reducer bushing and nipple. I looked at it and it appears to be zinc plated. Anyone happen to know the thread specifications? Just curious because some threads require compound . If I take off the reducer bushing is it safe to use an impact gun to Break it loose?