<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1276" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2>I haven't found any PSI specs on copper = either but I'm sure a local commercial plumbing supply can tell you.  = I have a vertical compressor that maxes out at 135 and the piston pump = transfers the air to the tank via a piece of 1/2" soft copper so I guess copper is = okay.  Let us know if you find any specific data.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Rob Goodale, RPT</FONT></DIV> <DIV><FONT face=Arial size=2>Las Vegas, NV</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <BLOCKQUOTE dir=ltr style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=cmpiano@comcast.net = href="mailto:cmpiano@comcast.net">Carl Meyer</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Thursday, March 18, 2004 = 5:59 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Journal Artical - = BAD IDEA!</DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Here's my beef!  I haven't been = able to get pressure rating anywhere.  I spent an hour on the net and looked = at McMaster Carr etc.  Lotsa rhetoric but no specs.  I'm sure = the rating depends on the diameter.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I give up.  Guess I'll just go = with 1/2 inch blue and hope it works.  </FONT></DIV></BLOCKQUOTE></BODY></HTML>