|Posted by hj on January 01, 2004 at 08:42:14:|
|In response to Re: natural gas black pipe unions|
It is more of a lubricant to allow the nut to move easier and thus tighten properly with less torque on the wrenches. It also allows the steel portion to mate to the brass insert easier.
: Strictly speaking, Nick is correct. No sealant is needed on a the faces of a ground union. My theory is that a light coating of a light teflon based joint compound acts as a lubricant and anti=corrosive agent.
: This is just my personal practice, and
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