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Old 04-15-2019, 12:44 PM   #1 (permalink)
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Macro on a new 98 custom

The fitting on the new 98cs isn't a regular macro fitting. Is is possible to buy that type of fitting that will take macro line? Or am I stuck using the steel line attached to it?
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Old 04-15-2019, 12:53 PM   #2 (permalink)
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If it has standard steel hose then the fittings on either side should be 1/8 NPT which is also what macro fittings are
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Old 04-15-2019, 06:57 PM   #3 (permalink)
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You'd have to mod the gun to use an older valve that has a 1/8th NPT. That would involve drilling 2 holes in the right side receiver, and possibly cutting out some space in the bottom to accommodate the new fitting. And of course, a new valve and powertube.

Short of that, there's nothing to do besides sticking with the steel line.
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Old 04-16-2019, 02:03 AM   #4 (permalink)
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I believe the new 98s use JIC fittings. You're not going to find one that can convert to macro.

Even if you did the side that connects to the valve is a custom length that the guy at the air hose store said he'd never seen before.

As Mag said the alternative is to modify the clamshell to take a regular valve. That will require a new powertube and a few holes to be drilled. Fitting should fit without further modification however it might sit deeper than you want making it hard to insert / remove macro line.

I did switch valves but have had mixed results. I'm currently tracing down some recock / low velocity issues.

Unless you're ready to do some troubleshooting I'd advise against it.
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Old 05-19-2019, 02:48 PM   #5 (permalink)
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Thanks for the responses!
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Old 05-28-2019, 03:42 PM   #6 (permalink)
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Could he use an older valve? One that is already tapped 1/8 npt?

Or flup his current valve over 180° and re drill/tap?
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Old 05-28-2019, 03:58 PM   #7 (permalink)
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Apamburn did that on his BB98, like he said in his post above. You have to drill the body for the side mounting screws, which isn't in and of itself but you must be very careful to get the hole placement correct. I think Apamburn said he had to cut the body a bit to get the fitting to work out the bottom, but that might have just been because of the vertical adapter he was using.
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Old 05-28-2019, 04:06 PM   #8 (permalink)
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Apamburn did that on his BB98, like he said in his post above. You have to drill the body for the side mounting screws, which isn't in and of itself but you must be very careful to get the hole placement correct. I think Apamburn said he had to cut the body a bit to get the fitting to work out the bottom, but that might have just been because of the vertical adapter he was using.
Why do you need to drill them?

Current 98s don't use those mounting screws, the power tube and valve are more of a free floating assembly than anything else, so do you have to do this?
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Old 05-28-2019, 04:11 PM   #9 (permalink)
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You do. The new valves are held in with the block the hose threads into. The pressure from the hose holds it in place. With an older valve in an older body, you'd be fine without them, but that's only because the RT/cyclone port on the powertube will hold the valve in place.
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Old 05-28-2019, 08:29 PM   #10 (permalink)
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I think the power tube may have been ok without the mounting screws, but not so sure about the valve.

Like magmoor said above, the valve in the new 98s is held in place by the fitting that pushes up through the square nut. I think tension stops it from moving, as does the fact that the square nut can't move in the cast body.

The screws give me a little confidence that it won't move around.

If I recall correctly, I did have to Dremel out a little of the body for the power tube to fit because it isn't shaped the same as the old power tube.
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