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🚽 Upgrade your flush game — efficiency meets effortless style!
The Siamp 32500007 Optima 50 is a WRAS-approved dual flush valve designed for easy retrofit in plastic or ceramic cisterns. Featuring adjustable height and overflow, it offers customizable water flow from 2 to 4.5 liters per flush with a high flush rate of 3.5L/s. Compatible with major brands and backed by a 10-year warranty, this durable mechanism ensures efficient, eco-friendly flushing with minimal installation effort.



| ASIN | B00VX68DIG |
| Best Sellers Rank | 4,529 in DIY & Tools ( See Top 100 in DIY & Tools ) 10 in Toilet Parts |
| Brand | SIAMP |
| Customer Reviews | 4.5 out of 5 stars 2,428 Reviews |
| Exterior Finish | Plastic |
| Exterior finish | Plastic |
| Included Components | 1 x Flushing Mechanism |
| Inlet Connection Size | 1.5 Inches |
| Inlet Connection Type | Female Iron Pipe |
| Inlet connection size | 1.5 Inches |
| Inlet connection type | Female Iron Pipe |
| Item Dimensions | 9 x 12 x 27.5 centimetres |
| Item Type Name | Siamp 32500007 Optima 50 Flushing Mechanism |
| Item dimensions L x W x H | 9 x 12 x 27.5 centimetres |
| Manufacturer | SIAMP |
| Manufacturer Warranty Description | 10 year. |
| Material | Ceramic , Plastic |
| Model Number | 03247230071302 |
| Number of Packs | 1 |
| Number of Pieces | 1 |
| Number of Ports | 3 |
| Outlet Connection Size | 1.5 Inches |
| Outlet Connection Type | FNPT |
| Part Number | 32500007 |
| Size | 27.5 cm |
| Thread Size | 38mm |
| Thread Type | BSP |
| Unit Count | 1.0 count |
| Valve Type | Dual Flush Valve |
M**N
Sorry plumbers
Saved a fortune. Watched a clip on how to replace the toilet valve , ordered the valve and fitted it myself. All very easy and saved myself a large plumbers bill. Good product, well made and reasonably priced.
A**K
Great replacement dual flush valve
I purchased this to replace an old model as the toilet kept flushing. It was easy to twist the old flush valve out and replace with new. Now no flushing issues and works well. Only point i would make is that the cord is slightly shorter that the old one. In addition, I had to use a hack saw to reduce the height of the overflow due to the size of my cistern. I have attached a photo of the old version to help.
A**R
Good but need instructions
Great. Easy to fit, unless your cistern is all boxed in without easy access like mine. Why no instructions with it? Don't know how to alter the flush volumes.
D**E
Great design for changing to new one
Bought this to replace an original Siamp flush in a hidden cistern toilet. I am a 56 year old woman on my own and I had no problems fitting it due to the twist and click fitting cage design. The old one twisted out no problem and this new one went straight in. The old one had been in for more than 10 years so I'm hoping this will last as long.
J**H
Easy to install and great functionality
Bought this to replace an existing one and it was super easy to swap out. It fitted perfectly into our cistern and works exactly as required. Will buy again if needed.
P**Y
Well engineered, no tools required to change lifed items.
Bought to replace a failed similar item from another firm. To remove the cistern cover required the buttons to be prised out and a plastic screw to be undone. A design blunder not present in this item. Visual inspection shows it is well engineered using good materials. Can see no reason why it should not have a long trouble free service life.. No tools needed for normal servicing, hence well deserved five stars. But black marks too. The printed instructions are inadequate. But see optima 50-49 on youtube. It runs for approx 15.5 minutes. However it is best to cut the overflow pipe with a sharp knife which leaves a clean cut. Before reinstalling the cistern stand it on a suitable bowl or bucket, put some water in the cistern and check for leaks. Also ensure that when the overflow pipe lifts on flushing that it cannot hit the bottom of the cable/button assembly. A very generous two stars for the printed instructions. I contacted siamp via their website contact form. My message was confirmed as sent, but I never got a reply. Big black mark and no stars for customer service. I contacted 18 months on. Working fault free, no problems have arisen.
R**K
Easy to fit and relatively low cost but …….
Key fact - these are supposed to come with a 10 year guarantee but there is no where to register the guarantee so how do you prove the age of old unit if it fails within 10 years? Did you keep the receipt? Did your plumber give you a receipt for the flush unit? I have now had to replace this flush for a third time in - 12 years. They fail every time where the flush cable attaches to the side of the flush tube, one of the two small (weak) plastic lugs that hold the cable in place breaks off and the cable comes away. It’s a design fault that needs addressing ( add a bit more strength here Siamp - easy fix during manufacturing) The unit is easy to swap- 1/4 turn anti-clockwise ( like an old lightbulb) and off it comes. The new one fits in the same way - easy. If Siamp could fix the design fault or sort out the so called “10 year guarantee” then this would get 5 stars but until these things are fixed it gets only 3 stars because you may find yourself replacing this flush unit every 5 years or so.
C**T
Great item for a direct replacement
Great item for a direct replacement. No need to keep the carrier (bottom section) as if you have a previous one fitted, just quarter turn to inlock the top section and swap over with the new section. No instructions so was a little confused as the water level was lower than the central overflow tube but you have to cut the centre tube with a fine tooth saw/hacksaw when you have determined the correct overflow height. The graduation son the side of the central tube give you a guide. Easy fit, ten mins plus sawing time. Reconnect up the push button and all good.
B**O
mécanisme de chasse
Trop petit car mon réservoir d'eau fait 50 cm de haut
B**.
Bra pris
Ser bra ut. Använde aldrig. Sparat för framtiden.
M**.
Compatible with old models, so it only takes a minute to replace a worn valve
Works perfectly, and only took a minute or two to install because I was replacing an older model whose base/seat is compatible with this model. The cable-based button makes it much easier to install and to lift the cistern lid in case I need to access the mechanism in the future. Replacing the flush valve myself saved the costs of buying a new toilet and hiring a plumber. It couldn't have been easier.
R**T
Works perfectly
Good product
S**V
Bien conçu et facile à installer
Je l'ai installé grâce à la vidéo de la marque qui est très claire (un monsieur avec un noeud papillon et des bretelles). La notice en français est à chercher sur le site de la marque également. Le chasse d'origine était une SIAMP aussi et comme celle-ci a duré 16 ans, j'ai repris la même marque. 1°/ Une petite déception : cela n'est pas fourni avec une clé de serrage de la bague à visser sous le réservoir, j'ai du en acheter une qui me resservira. J'ai cru alors que le produit n'était pas étanche quand je vidais la chasse. En fait, mes toilettes avaient un coude de chasse en plastique qui avait un joint qui est resté dans le pied du WC au démontage et que je n'avais pas vu laissant passer toute l'eau. 2°/ Mon ouverture dans le couvercle du réservoir pour le bouton pression était supérieur au tableau de la marque (5 cm) mais la rosace s'adaptait quand même. 3°/ Attention aux joints blancs à serrer sous le réservoir d'eau sur les vis qui le maintiennent: si vous serrez trop fort ils peuvent se couper. Les joints doivent s'étaler un peu pour garantir une étanchéité. Sinon très bon produit, fonctionnant très bien et étanche. Dommage qu'il ne soit pas livré avec une clé de serrage plus pratique qu'une clé pélican.
Trustpilot
2 months ago
3 weeks ago