<HTML><FONT FACE=arial,helvetica><FONT SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">In a message dated 5/24/2003 1:11:12 AM Eastern Daylight Time, Rcmaster199@aol.com writes:<BR>
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<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj:<B>Re: 3M / OS header O-ring size </B><BR>
Date:5/24/2003 1:11:12 AM Eastern Daylight Time<BR>
From:<A HREF="mailto:Rcmaster199@aol.com">Rcmaster199@aol.com</A><BR>
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In a message dated 5/24/2003 12:39:47 AM Eastern Daylight Time, davidflynt@earthlink.net writes:<BR>
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<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">Subj:<B>RE: 3M / OS header O-ring size </B><BR>
Date:5/24/2003 12:39:47 AM Eastern Daylight Time<BR>
From:<A HREF="mailto:davidflynt@earthlink.net">davidflynt@earthlink.net</A><BR>
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</FONT><FONT COLOR="#0000ff" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Jim,</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#0000ff" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Take the piece or the o-rings down to your auto parts store, and ask to see their o ring collection. Find the one that fits. If it is a decent parts store, they will have dozens of sizes. I shop at Napa for these.</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#0000ff" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">David</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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<BLOCKQUOTE TYPE=CITE style="BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px; PADDING-LEFT: 5px">-----Original Message-----<BR>
<B>From:</B> discussion-request@nsrca.org [mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>Woodward James R Civ 412 TW/DRP/ACQ<BR>
<B>Sent:</B> Friday, May 23, 2003 10:11 AM<BR>
<B>To:</B> discussion@nsrca.org<BR>
<B>Subject:</B> 3M / OS header O-ring size<BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Hi All,</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Does anyone have a part number or size that I can use to go to the hardware store and get some more of the rubber o-rings for the headers?</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">I've found that if you don't support the pipe and header, they wear out fast!</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Thanks,</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Jim W</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"><BR>
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Jimbo, David,<BR>
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Just a word of caution. The auto or hardware store variety is probably made of Neoprene or something similar. This type of rubber is okay to get you out of bind temporarily, for a flight or maybe two, but no good long term. Teltale signs of the wrong rubber type are quick wear, flat spots, hardens quickly and cracks.<BR>
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You should try to get fluoroelastomer o-rings, like Viton, or silicone rubber. McMaster Carr will most likely have what you need, but you'll ned to measure the ring. The local ACE, as Dave suggests, would be able to get the measurement for you, if you don't have access to a mic or caliper<BR>
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good luck<BR>
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matt</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=3 FAMILY="SANSSERIF" FACE="Arial" LANG="0"></BLOCKQUOTE><BR>
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</FONT><FONT COLOR="#000000" style="BACKGROUND-COLOR: #ffffff" SIZE=2 FAMILY="SANSSERIF" FACE="Arial" LANG="0">Jimbo,<BR>
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I forgot that I have a set of the rings. These measure as follows: 27mm ODx20mm ID x 3.5mm thick. That's approximately 1.062 ODx 0.8 ID x 0.135 thick.<BR>
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Matt</FONT></HTML>