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Air Arms T Bar Fill Valve Swap

Discussion in 'Technical' started by saddler1980, Sep 14, 2020 at 10:16 AM.

  1. saddler1980

    saddler1980 Engaging Member

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    is the newer T bar fill valve a direct swap for the older style? I'd like to have all my rifles on the same filler if possible
     
  2. Roger Archbold

    Roger Archbold Busy Member

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    Best-fittings do an upgrade, not exactly cheap, I've been thinking of using their fill valve upgrade, which is basically going back to a snap on coupler and doing away with the new type brass fitting, reason is, I've got about 4 of the new type, and they seem to be specific to each rifle i.e. Not interchangeable, unable to find any reason for this, I know none of this helps you, just wanted to get it off my chest. Rog
     
    saddler1980 likes this.
  3. Bezzer

    Bezzer Posting Addict

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    It's worth getting the Best fittings valve conversion, done it for mine, a lot easier than OE
     
  4. shadowryder

    shadowryder Tinkering in Wales!!

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    I fitted the huma probe and guage type on my s200 its much better.
     
    Coggie likes this.
  5. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    To actually answer your question the inlet valve housings are different between the original "snap connector" and current T-bar setup, so also require replacing which can be a ballache as you need an appropriate tool to remove the housing from the end of the cylinder and they're often pretty tight.

    If you have an earlier rifle AA do an "upgrade kit" that contains everything you need (although you can retain your existing valve cover so it looks original ;) ) for about £60 at a guess; as illustrated in my Ultimate Lashup thread ;)
     
    saddler1980 likes this.
  6. saddler1980

    saddler1980 Engaging Member

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    Would you mind if i drop you a PM with a few questions? I want to start a "HFT400" build
     
  7. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    I would mind, yes :p

    As per my sig let's keep in on the thread please. You should be able to get most if not all of the info you need from my lashup thread as that's basically just an S400 MPR in a US / HFT stock ;)
     
    Coggie likes this.
  8. saddler1980

    saddler1980 Engaging Member

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    I'm planning on a build, any idea if the newer barrel (S401B) will fit with my early pre AT bolt housing from my carbine? I'd like to add the full length barrel and cylinder (S335)?
    Cheers
     
  9. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    The larger-diameter MPR barrel and associated block notwithstanding, all barrels are interchangeable in the blocks regardless of age or calibre. Cylinders are all interchangeable too. I'd question the value in doing this swap though as these two parts will cost the best part of £200, which is more than halfway to a decent used S400 ;)
     
    Coggie, Rotherham Owl and saddler1980 like this.
  10. Roger Archbold

    Roger Archbold Busy Member

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    Hi Bezzer, just looked at the Best fittings upgrade kit, did you have to change the fill valve body to do this, also the cover cap ? I should be going to Somerset either this week or the week after, and can then drop into their premises in Gillingham. It sounds like a good way to solve my problems with the brass fittings. Cheers Rog
     
  11. Lev Levvin

    Lev Levvin BEAST OF BODMIN

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    If you have the very early chunky snap fitting on your s series... like this...
    975E7AB5-8613-46E8-9230-C7B58AA6C74D.jpeg
    then you will need the full best fittings kit to upgrade...

    either the older T bar type (which I don’t like... had one blow off under pressure and scare the bejesus out of me!! ) 3CFAC065-333E-49B4-88AF-B85A705CB6E8.jpeg

    or the newer Foster type which is the benchmark for many new guns from daystate etc 4BADF2E4-7E02-4841-B09E-583181B0DD4E.jpeg

    you will need a two-peg cylinder tool available on eBay for @ £15
    0C521C07-D180-46DE-98DC-9979A648021B.png

    I made my own on lathe.

    if you already have a T bar filler then it’s cheap and easy to upgrade to a foster valve kit FD5100F2-5EB4-4CEC-9A8F-E6E681E0EB6A.jpeg

    Well worth doing :thumb:
     
    Coggie and saddler1980 like this.
  12. Roger Archbold

    Roger Archbold Busy Member

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    Cheers Lev, it was the foster I was thinking of, £12 got to be done, already have all the tools.
    What I wanted to know was, will the original fill valve cap still fit. Rog
     
    Lev Levvin likes this.
  13. squib

    squib Keyboard Hero

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    The lane quickfill assembly is about £70, and a doddle to do.
     
    Coggie likes this.
  14. Roger Archbold

    Roger Archbold Busy Member

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    Cheers squib, the doddle I can handle, but £70 might be harder to come by. Thanks
     
    squib likes this.
  15. saddler1980

    saddler1980 Engaging Member

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    Think i've located one, we'll see thursday :thumb:
     
    cloverleaf likes this.
  16. Roger Archbold

    Roger Archbold Busy Member

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    Ordered 2 of the foster types from Best-fittings £24 well spent
    Now, what else can I b****r sorry meant fix. Rog
     
    Lev Levvin likes this.
  17. Lev Levvin

    Lev Levvin BEAST OF BODMIN

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    @cloverleaf... talking of AA cylinders and barrels...

    I noticed today that my s510xs air tube has a few really tiny rusty pinpoints on it...

    should I be concerned and out the tube...buy a new one...
    or will it be safe to oil it up with gunex ?
     
  18. cloverleaf

    cloverleaf Super Moderator Staff Member Mod/Admin

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    If it's just surface rust remove it with 0000 wire wool and keep it oiled ;)
     
    Lev Levvin likes this.

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