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Old 09-19-2006, 11:51 PM   #1 (permalink)
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Brass N Wood Fan
Palmers Fan
RTP Fan
P-12 air leak

OK, this may be a simple question for you, but I would rather have someone here tell me the answer than use time to search for myself right now.

I picked up a near mint P-12 for a STEAL, but it has a SLIGHT leak down the barrel. I got a good 15-18 shot out of a 12gram before I started seeing a definate decline in arc. I did not take the time to get out my chrono yet.

Before I tear it apart, anyone here have an idea of which part I am going to need to replace?

Thanks in advance for the high quality help that this forum gives.

**I also have a Piranha LB coming that has a leak. I bought that one primarily for the battle grip pump that was on it...but that is a different thread and story.
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Old 09-20-2006, 12:00 AM   #2 (permalink)
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It is either the cupseal (most likely) or an o-ring in the back half of the valve, either way you will need a valve tool to find out and it should be diagnosable upon inspection.
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Old 09-20-2006, 12:03 AM   #3 (permalink)
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Thanks, I have the valve tool just not the time right now. I believe that the Piranha needs a cup seal as well.
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Old 09-20-2006, 12:08 AM   #4 (permalink)
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call up PPS and order a rebuild kit and you'll be good to go.
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Old 09-20-2006, 01:09 AM   #5 (permalink)
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Try heating up the cupseal indirectly with a gas stove. Just hold the metal part of the stem over the flame with some manner of tool. It'll melt a bit, ( not too much!) whereupon you let it cool slightly and then place the valve on it to remold a seal.
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Old 09-20-2006, 01:09 PM   #6 (permalink)
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Ok, to sound stupid, which is the "cup seal". The piece with the stem?

Thanks.
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Old 09-20-2006, 01:10 PM   #7 (permalink)
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yes, it is the brass piece with the rubber seal on one side and a pin running through it. If you have the valve apart take a look at the valve seat (the part that the cup seal seals against) and make sure that the lip has no nicks or dings that could have caused a fault in the cup seal.
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