JT Tac 5 air input? Need help!

[Frizzle Fry]

OK, so I've got an old style Tac5 and it's got an odd air input. It's got 98-style internals, but rather than having a 1/8npt input to the valve, it has a piece (1) that fits around the hose, and screws in to the body, holding a nipple with an O-ring (2) in to the valve and sealing it. This crappy photoshop shows what I'm talking about (but hopefully someone knows about this already).



The nipple (2) seems to be threaded on to the hose, but it's brass so I don't want to wreck it by throwing anything more than a strap wrench on it to remove it. Anyone know how to remove it?

Also, the tightener (1) seems big enough to fit a standard 1/8npt fitting through it, but I can't seem to find a micrococker/spyder ASA with a long enough threaded-bit to extend all the way through... To that end, I'm fairly sure that part (2) won't accept 1/8npt threading anyway! Does anybody know the specs on this stuff, or what my options are? Ideally I'd like to be running 88g or 12g cartridges, and I do not want any hoses; just direct input.

Thanks guys!

[Frizzle Fry]

Anyone? Please?

[1stTarget]

This is not what you want to hear. I took out the JT valve, and replaced with a Tippmann valve. Had to drill holes to use the valve retention screws tends to favor. The other choice is to order new hose setup from JT. Then cut hose, put 1/4 to 1/2 adapter to put a 12 gram holder on. The second way involves a lot of fitting and o-rings and JB weld.

[Frizzle Fry]

Crap. Neither of those sound fun. Got any pics of your modified 98 valve? I've got a few lying around but seeing it would beat trial 'n error.

[1stTarget]

Tipp valve: paper template for retention screws.
Then use a 1/8 pipe extender(not right term) to hold valve in place, inside marker without power tube. Use slim ruler, measure from both front and back of marker. Put masking tape on right side of marker draw lines to show both ends of the valve. Then put template between the two lines. This shows where holes have to be drilled. To drill holes you really need a drill press and vise set up.
I do not have a digital camera so pictures are not available. Sorry.
Then find a 1/8 to 1/8 connector. Put valve in power tube, slide in to body, put on retention screws. Figure out by test fitting shortest length of pipe needed. On other side place 1/8 to 1/2 asa adapter. I believe it is 1/8, but could be 1/4 NPT(national pipe thread), Do not use screw size, must use NPT.
Yes a lot of work. But as this is my hobby, I did it last winter as a project to pass the time.

[Frizzle Fry]

OK, I think I'm gonna do this. A couple questions...

a) Do I just snap off the little "nub" on the 98c powertube?

b) Will the JT hammer system still work OK?

c) Do I plug the "holders" (screws that keep the JT valve in place) or drill out the 98c powertube to accept them?


Thanks man!

[1stTarget]

a.No do not use 98c tube, snapping nib causes major air leak. original from 98 Tippmann, no 98c power tubes, and a metal one is better fit.
b. Yes, but may need to make a new connecting rod.
c. You can ignore original tac 5 hole, no need to use or fill. Drill new holes in tac 5 to allow 98 screws to hold 98 valve. Be careful. If you drill holes wrong, can be fixed, but time consuming.