PrimoChill 1/2in. Rigid Fitting to Flex Tubing Insert - 12 Pack


SKU: RF-RSX3812-12N/AAvailability : In stock - In Boise, ID USAIn StockOut of stock

PrimoChill's RSX compression fittings has made color adaptation in your system seamless. Expanding on that we brainstormed up these inserts to allow you to use flexible tubing with Rigid fittings. This... Read more


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PrimoChill's RSX compression fittings has made color adaptation in your system seamless. Expanding on that we brainstormed up these inserts to allow you to use flexible tubing with Rigid fittings. This concept allows you to switch between flexible and rigid in your system without buying new fittings. Take it one step further and use mix matched tubing in the same system while all fittings look the same! These inserts are compatible with RSX, Revolver and Ghost compressions and couplers.

The RSX fitting truly represents the principles of PrimoChill. A fitting built for functionality complimented by its distinct aesthetics. Now  available for all applications.


Tube Insert expands on PrimoChill compression fittings that lead the industry in innovation and ease of use.

A continuous industry leader in style and function within the water cooling community.

Quick and simple installation with minimization of leakage

  • Material: Nickel Plated Brass
  • Height:10mm total
  • Tube Compatibility: PrimoFlex Advanced LRT Flexible Tubing - 3/8in. ID x 1/2in. OD
  • Fitting Compatibility: RSX, Revolver and Ghost compressions and couplers.
Included Parts
  • 12x PrimoChill 1/2in. Rigid Fitting to Flex Tubing Insert
  • Cut flexible tubing end square
  • Push insert into tube end untill flush
  • Follow same installation as rigid tube usage (see below)
  • Install thread o-ring snug to base
  • Install tube o-ring on outside of tube, inside of the compression cap
  • No installation tool required for cap. Finger tighten only.
  • The Revolver tool was designed for removing the cap only, not installing them.
  • RSX caps are coated with a durable powder coat but we still recommend handling with care so you can enjoy the finish for years to come.
Make sure to follow external o-ring installation as normal once insert is installed. The insert gives the flexible tubing some rigidity to allow you to install it as if it was PETG.

Customer Reviews

Based on 4 reviews
Daniel B.
Saves a few bucks!

Simple, easy to use. Great for a filler hose and saves you a few bucks if you've already got hardline fittings

john a.
It’s good

Works just as described

Stephen K.
Very Suprising

I put these into a test system on the wetbench and was pleasantly surprised at just how well they work. Took some practice as some flex tubing wants to turn with the fitting cap as you tighten it but that's the same with most flex tubing setups anyway. Really happy with this and now I do not have to order a bunch of fittings for my test setup.

Benjamin L.
Pleasant suprise

At first I was skeptical when I saw this product. But it's works as advertised! Easy installation with flex tubing and so far no leaks in my rebuilt system!

Shipping Policy:

We ship via USPS and Fed Ex . For international orders we ship via Fed Ex and DHL. Air shipments will be delivered on the normal business day scheduling provided via the selected carrier. Unfortunately we are not able to ship out orders for specific Saturday deliveries. During peak season carriers suspend their delivery guarantees and delays are common.

Same Day Shipping:
We strive to ship out every order same day if the order is placed by 2:00pm MST. If not, the order will ship out the next business day. Orders with custom powder coating (SX Colors) can take up to 1-4 business days to coat, inspect and pack so please be aware of this. Selecting overnight shipping method or rush fee will not ensure that your order ships same day and is not guaranteed.

Shipment Refusal:
If a shipped order is refused or returned undelivered there will be a mandatory 20% restocking fee, a $20.00 Return Service Fee and no refund on the shipping cost. Please be aware that refusal is significantly more expensive then using your own carrier and is NOT recommended. 

Damaged Items:
All packages are fully insured at no additional charge.

If you receive a damaged package, you must notify us within 48 hours of receipt. Sending back damaged merchandise voids the shipping insurance and no credit will be given. Damaged packages must be held for ten days with original packaging for carrier inspection. All packaging and packing materials must be kept for this inspection.

If your package is marked delivered and not received, please contact immediately for further assistance.

International Shipping:

For international customers please reference this page for duties/tax information. 

Returns Policy for New Products:

RMA Number:
Returns will not be accepted without an RMA number provided from

Product Return:

Products returned for credit must be received within 30 days of invoice date and a 15% restocking fee may apply. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

All returned items must be in like new condition with all related parts including screws, manuals, etc. If you have lost, thrown away, scratched or opened sealed boxes or bags – a higher restock fee may apply upwards of 50%. Products that have had fluid ran through them are subject to these higher restock fees.

Only regular priced items may be refunded, unfortunately sale items cannot be refunded this includes B-Stock and Used/Open Box Products.

If a customer is misleading about the defect and evidence of incorrect install/use or tampering has occurred, the return my denied and a higher restock fee may be assessed or the return may be completely denied. A qualified technician will test each returned product for defects. will not assess a restocking fee for defective products.

Return Shipping
Customers are responsible for ALL return shipping charges on merchandise for any reason. Unless otherwise noted, shipping on products and returns is non-refundable, and returning a product comes at the expense of the customer. Customer will be responsible for paying shipping products/orders back to For no reason do we refund the outbound shipping cost.

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PrimoChill 1/2in. Rigid Fitting to Flex Tubing Insert - 12 Pack