Gaggia Classic OPV spring mod kit - Standard version (just springs)

OPV springs

Gaggia Classic OPV spring mod kit - Standard version (just springs)


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If you have a newer style Gaggia Classic (depending on the market, this is either models after 2015 for the EU or models after 2018 for the US), then you will have a new style OPV valve - as shown in the Gallery images.

It is mainly relevant to the following Gaggia models:

  • RI9403/??- UK/EU "New" Gaggia Classic 2015-2018 (with different internals to the traditional Classic)
  • RI9480/?? - UK/EU new Gaggia Classic 2018-  (with three separate switches on the front)
  • RI9380/?? - US new Gaggia Classic Pro 2018- (with three separate switches on the front)

This product was designed for the new Classic models (Classic Pro / Classic 2019) though is also relevant to the EU RI9403/?? (2015-18) model - as it uses the same fixed OPV.  Some other Gaggia models (eg Baby) may also use this similar valve, and hence this kit will also apply if it uses a similar pump-mounted black plastic OPV.

This new style OPV valve is characterised by being a black plastic valve attached to the top of the pump - that has TWO pipes leading from it, as can be seen in the Gallery images.

This product is the standard version,  which is just the different pressure springs, and is relevant if your machine already has TWO pipes visible within the water tank, as also shown in the Gallery images.

If you only have ONE pipe visible in the water tank then you need the PLUS version of the kit (that includes additional pipe).

Spring pressures

The 9 bar spring is great for general use, and is the "industry standard" espresso extraction pressure.  Most people will use this one.

The 6.5 bar spring is good for some espressos, and lower pressure extractions are being used in many coffee shops now.  It's worth trying this one, as you may prefer the taste and mouthfeel that lower pressure extractions produce.  Some careful installation of the spring and replacement of the floating valve seat may be required with this one, otherwise you can find that steam pressure will leak out of the valve and reduce your steaming power.

The 5 bar spring is very low - and again it's great to try it - but this one is quite low pressure and can cause some challenges when you steam; as the steam pressure can escape from the OPV if it exceeds 5 bar.  Great for straight espresso or Americano lovers though.


Please remove the lid from your espresso machine (the two small screws at the rear of the machine, within the black plastic lid) and absolutely confirm that your pump looks like the one shown within the Gallery images - with the black plastic valve that has TWO pipes attached.

This kit contains:

  • 9 bar spring
  • 6.5 bar spring
  • 5 bar spring
  • Installation instructions

NOTE that once you have bought this kit and checked out, the installation and use manual will be sent to you as a PDF digital download - so you can start reading.

DISCLAIMER:  The installation of any of our parts or kits, and any modification of any espresso machines undertaken by reference to our installation and/or user guides, should only be conducted by persons with proper electrical safety knowledge who are capable and qualified to undertake such work and modifications.  Many of the components within espresso machines operate at high temperature, high pressure and with mains electrical voltages at high current in the presence of water – any of these could cause serious personal injury, shock, burns, fire, explosion, other property damage and possibly death.  We shall hence not be liable for any damage to property, personal injury or other loss caused by the improper or incorrect use of the aforementioned installation and/or user guides or the provided kit(s) or any of those kit’s component or constituent parts.  By commencing installation of our kit(s) you agree to accept all liability associated with the modification of your espresso machine, and agree to hold us in no way responsible or liable for any loss, damage or injury howsoever, wherever or whenever caused.  You further agree to indemnify us and our agents, officers, directors and employees, immediately and on demand, against all claims, liability, damages, costs and expenses, including legal fees, arising out of any installation, use, misuse or failure of any of our kits or component parts thereof.

This is a great tweak to your Classic at a very low price! I ended up using the 9 bar spring, which was very easy to install. I initially tried the 6.5 bar spring, but it gave me some trouble when steaming because it (obviously) applies less pressure to the gasket, which in turn had trouble seating properly and would leak steam/water once the boiler got above about 140C. This caused it to lose steam pressure quickly. If you hear a horrible bubbling/boiling sound, that's signals that the gasket isn't seating properly and you're losing pressure. After about four tries at cleaning things out and re-seating it, I decided to try the 9 bar spring. The 9 bar spring was super easy to install and gave me no trouble at all. I'm sure the 6.5 bar spring would work with a bit more patience, but I'm very happy with the 9 bar. This is a great, inexpensive upgrade!


Easy to install, simple instruction guide. Can't really go wrong. I've only fitted the 9 bar spring but nice to have the others for later experimentation.


Really simple and easy mod, that greately improves extraction. Also inexpensive and easily reversable, with very clear installing instructions. The additional venting mod of the plus kit really makes sense, it's neat and the drip tray does not get full so quickly. I highly recommend it.


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from Kirk Barnes

Your question:

I see that you indicate that there may be a loss o f pressure in the steam valve if the 6.5 or 5 bar spring is used. You make no claims in regards to the 9 Bar spring could you please indicate if I will see a loss of pressure (and if so how noticeable) if I install your 9 Bar spring mod. Thank you
Our answer:

Good question - and thanks for asking.  Normally the steam pressure is comfortably contained by the OPV - and this is definitely the case with the 9 bar spring;  when you use the 6.5bar spring then you MAY find that if the valve cap isn't seating properly then steam pressure can leak out (reseating it properly usually resolves this).  If you have a PID with much higher than standard steam pressure then this higher pressure can sometimes also leak with the 6.5bar spring.  Whilst the 5 bar spring is good to try and experiment with, it's good for espresso and Americano drinkers - but if you steam then you will probably find that steam and water escape via the OPV as the containment pressure is low.

So - in summary - you shouldn't have any steam issues with the 9 bar spring, and if you do then you can usually resolve this by reseating the spring and valve cap.   Typically 6.5bar will be fine too.  5 bar may have steam pressure issues.

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from John Koroglu

Your question:

hi there. just wanted to confirm that the tallest of the three (3) is the 9 bar variant? before going ahead and installing it (springs were not marked as to what rating they are..) thank you!
Our answer:

The fitting instructions (that you are emailed a link to after purchase, and a link to them is also provided with the kit ) show photographs of the springs, and gives you an explanation of the pressure that each spring provides.   The longest one is 6.5 bar, then there are two shorter ones - the firmer one (when squeezing the springs gently and slightly from end to end) is 9 bar, and the softer one is 5 bar.

Hope this helps!

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from Damiano

Your question:

Hi, I just purchased a Gaggia Classic Pro 2020. I would like to know if this kit would work. I would to bring down the pressure to 9.5 bar. Thank you!
Our answer:

Thanks for asking the question - and yes, this kit is designed for exactly that purpose.  Its for the Gaggia Classic Pro (or Gaggia Classic 2019, or Gaggia Classic 2015-2018 in the EU, with the new plastic OPV on top of the pump) - and it provides three replacement springs;  one lowers the pressure to 9 bar, another to 6,5 bar and the third to 5 bar.

If you have a US Gaggia Classic Pro then you probably just need this Standard kit - you probably don't need the PLUS version.

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from sandy

Your question:

Hello, There is a heavy debate about optimal espresso pressure being 11bar for vibration pump machines (gaggia classic) in contrast to the good old 9 bars for rotary pump machines. What is your opinion on that? And is it possible to order also a spring calibrated for 11 bar? I would really like to test it out for myself, since in the end the taste of the espresso remains the most important factor. Thank you very much Cheers
Our answer:

Thanks for your interesting query.  I don't believe there is ANY debate about the use of 11 bar for extracting espresso on vibe pump machines today.  What you may be referring to is an old YouTube video from 2012 that includes Bezzera stating that they use 11bar for vibe machines (and many people still refer to this today and some even believe it!).  A few months after this video came out, they released a mod kit for their own machines that reduced the 11 bar down to 9 bar as they realised that they were wrong in using 11 bar.  So 9 bar is preferable to 11+ bar - but today, the debate is whether an even lower pressure is better... hence the 5 bar and 6.5 bar springs in our kit.   Many good coffee shops are extracting at 6-7 bar today, in preference to the good old 9 bar of yesterday.

The standard OPV spring in the Classic Pro / Classic 2019 is rated at 11.5-12 bar, so if you have a standard spring today then you are using something around 11-12 bar as the maximum brew pressure already.


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from Mike

Your question:

How will the mod from the OEM 12 bar down to the 9 bar spring impact the recipe? All other things being equal, I assume the grind would need more fine to produce the same pull. Is that right? Thanks!!
Our answer:

Thanks for your question Mike - and yes,you'll typically find that as you lower the pressure of the extraction you should (or rather can) make the grind finer accordingly.  This can be quite noticeable when dropping from 12 to 6.5 - and perhaps less so when going from 12 to 9.

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