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1/4-NPT Drain end Filter Cap (Stainless steel)

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  • These caps are drilled thru .453" and threaded with 1/4" female pipe threads.
These parts are for Wix 24003, 24744 / Napa 4003, 4744 filters only and may not fit Chinese after market filter tubes.
  • These parts are for Wix 24003, 24744 / Napa 4003, 4744 filters only and may not fit Chinese after market filter tubes.
  • These parts are for Wix 24003, 24744 / Napa 4003, 4744 filters only and may not fit Chinese after market filter tubes.
  • All of our Wix / Napa parts are designed to fit Original Wix / Napa filter tubes.
Part numbers, Wix 24003, Wix24744 / Napa 4003, Napa 4744. The filter tube dimensions and threads are identical on all of these part numbers. The only difference is the internal filter micron measurement.
Twin Tech Tactical
RRP: $35.35
$30.21 (You save $5.14)

 Product Description


These WIX 24003, 24744 / NAPA 4003, 4744 filter caps allow you to attach a WIX / NAPA filter assembly directly to your muzzle thread without the use of an adapter. They are made form 416 Stainless Steel, use the same o-rings and are much more corrosion resistant and durable than the original aluminum caps. Weight 6.8oz. (193grams)

The center hole of the 1/4-NPT cap is drilled thru to .453" diameter and threaded with female 1/4" National pipe threads so you can attach a 1/4" pipe plug or valve with 1/4" NPT thread.

You can also purchase a solid cap with no hole in the center if you don’t need a drain.

These caps are for genuine Wix 24003, 24744 / Napa 4003, 4744 filter tubes only and may not fit  metric Chinese after market filter tubes.  




BUYER UNDERSTANDS THAT THESE PARTS ARE NOT SUPPRESSORS AND OR SILENCER PARTS IN ANY WAY SHAPE OR FORM.  Buyer fully understands that they waive their rights to ANY claims against Twin Tech Tactical for ANYTHING. These parts are sold for the intended purpose of cleaning firearms and solvent storage ONLY! In other words Twin Tech Tactical is not responsible for how these parts are used or modified after you receive them. Any modification to, or misuse of our parts is the sole responsibility of the purchaser. Twin Tech Tactical and its employees are not responsible for the actions of their customers or the manner in which they use our parts and will NOT accept any liability in any way morally, legally, or financially. These parts are legal to posses and use as sold, and we assume and expect that all of our products purchased by you are used for their intended purposes only and discourage any modification or misuse of any kind.

By purchasing our products you agree to the Terms of this website.

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 Product Reviews

  1. Precesion workmanship

    Posted by Warren Tingler on Jan 7th 2018

    I am a machinist by trade, and the workmanship and the precision machining that went into these products is outstanding.

  2. Another top quality product form Twin Tactical

    Posted by Unknown on Dec 15th 2017

    Top quality and craftsmanship. Just as I expected. These are very high quality . Highly recommended.

  3. HEAVY duty....

    Posted by Deez on Jun 26th 2017

    Emphasis on the heavy. The machining is nice and it fits perfectly but it is way wayway heavier than will be useful for any Form 1 builds .
    A substantial amount of material needs to be removed from the underside to make it a viable non solvent trap part. Otherwise it is a really nice piece!

  4. Very professionally made

    Posted by Steve R on May 22nd 2017

    I've worked in a Tool & Die shop 2 different times and I know quality work. This is not an easy piece to manufacture, requiring several processes.
    A beautiful piece

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