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Aluminum Flat Top Valve & Piston Kit
For Crosman 1322 1377 2289 P1322
P1377 |
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MAY
2021 UPDATE: The piston now features two o-rings for better
compression. Looks a lot more professional, too.
MAY 2021 UPDATE x2: A solid brass
piston is now available. It's fancier. It's heavier. It's bling that only
you know is inside...?
APRIL 2023 UPDATE:
Crosman 362 Flat Man's Pack now
available.
APRIL 2023 UPDATE x2:
Adjustable Pistons now
available.
- The Flat Top upgrades are immensely
popular with Crosman pumper enthusiasts. The idea is that by giving the
gun a larger air reservoir, you can do more work per pump, resulting in
the same shot velocity with FEWER pumps. Or, increase velocity with the
same number of pumps over OEM.
- You can buy just the Flat Top Valve,
just the Piston or the Complete Kit.
- Note that you should not install just
a Flat Piston with an OEM valve. The gun won't cock completely and will
be useless.
- You can, however, install just the
Valve.
- But the smart move is to install the
complete kit.
- Want even more mods? Consider the
Flat Man's Pack, which is the
Flat Top Kit + Power Spring + Max Flow
Bushing.
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- The Flat Top Valve is an OEM Crosman
valve that has been heavily modified.
- First, we put it on the mill and angle
the exhaust so the escaping air doesn't have to make a hard 90° exit.
- After that, we straighten up the
exhaust hole with a nice six-fluted bit.
- Then, we flatten the face to allow
more air to be pressurized per pump.
- Finally, we remove as many machining
marks as we can to make a perfectly smooth exterior.
- And, of course, the valve is cleaned
and polished prior to reassembly with BRAND NEW o-rings.
aluminum flat valve
brass flat valve |
- This is the Flat Top Piston. It is
7075 aluminum milled from scratch. A solid brass version is available,
too.
This is the older single o-ring style. All
shipments will feature double o-ring pistons as shown below. |
- And here is the complete kit.
Full Kit |
Install Video |
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- Here is the kit with the brass piston.
Brass Piston
Related:
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While you can buy the
valve-only and piston-only individually, they're not designed
to be used with competitor's products, nor will they work with non-flat parts.
The Flat Valve won't work with an OEM Piston and vise versa.
But, they are available, if you have a specific project you want to
accomplish. |
REVIEWS |
Joshua M - Pennsylvania - June 19 2024
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