# Tslim X2 Piston Squeaking when Filling

**URL:** <https://forum.fudiabetes.org/t/tslim-x2-piston-squeaking-when-filling/9307>\
**Category:** Type 1 & LADA\
**Tags:** tandem-x2\
**Created:** [February 12, 2020, 12:45pm UTC](https://forum.fudiabetes.org/t/tslim-x2-piston-squeaking-when-filling/9307 "2020-02-12T12:45:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![T1DNurse](https://avatars.discourse-cdn.com/v4/letter/t/8dc957/32.png) [@T1DNurse](https://forum.fudiabetes.org/u/T1DNurse)\
**Post date:** [February 12, 2020, 12:45pm UTC](https://forum.fudiabetes.org/t/tslim-x2-piston-squeaking-when-filling/9307/1 "2020-02-12T12:45:41Z")

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My x2 squeaked while filling a new cartridge today, first time. Not sure if this is something that is common or should I call tech support? I’ve had my animas vibe/ping for 13 years and it never squeaked with that rotating screw piston thing. Thoughts?

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**Author:** ![Breezy](https://avatars.discourse-cdn.com/v4/letter/b/b3f665/32.png) [@Breezy](https://forum.fudiabetes.org/u/Breezy)\
**Post date:** [February 12, 2020, 4:27pm UTC](https://forum.fudiabetes.org/t/tslim-x2-piston-squeaking-when-filling/9307/2 "2020-02-12T16:27:40Z")

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You might call tech support anyway but the x2 has no piston thingy like the Animas did. It is a completely different insulin delivery system based on air pressure. There was a complete explanation of the x2 delivery system made on this forum in the last 6 months. You may wish to look it up. Did you mean that this was your first time filling a cartridge? My x2 squeaks when filling the tubing each and every time. It is somewhat like a wheezing in-breath that it takes every few “puffs” out. Normal. That’s what it does.

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**Author:** ![T1DNurse](https://avatars.discourse-cdn.com/v4/letter/t/8dc957/32.png) [@T1DNurse](https://forum.fudiabetes.org/u/T1DNurse)\
**Post date:** [February 12, 2020, 4:36pm UTC](https://forum.fudiabetes.org/t/tslim-x2-piston-squeaking-when-filling/9307/3 "2020-02-12T16:36:08Z")

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Thanks yes that is it. Never did it before, now I know. 👍🏻👍🏻

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**Author:** ![Randy](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.fudiabetes.org/randy/32/5435_2.png) [@Randy](https://forum.fudiabetes.org/u/Randy)\
**Post date:** [February 16, 2020, 10:53pm UTC](https://forum.fudiabetes.org/t/tslim-x2-piston-squeaking-when-filling/9307/4 "2020-02-16T22:53:42Z")

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The Tandem cartridge has an empty plastic bag inside, and when you first start filling it with insulin it makes a sound as the plastic opens up. To me it sounds more like expanding plastic than a squeak.

If you reuse a cartridge it doesn’t make the sound. You can confirm that by saving a syringe and just injecting water in an old one before you throw it away.