--- product_id: 517476916 title: "Ibergrif M20521 G3/8 inch (16mm) Toilet Inlet Valve, Bottom or Side Inlet, Float Valve" brand: "ibergrif" price: "$41.34" currency: USD in_stock: true reviews_count: 13 category: "Ibergrif" url: https://www.desertcart.us/products/517476916-ibergrif-m20521-g3-8-inch-16mm-toilet-inlet-valve-bottom store_origin: US region: United States of America --- # Dual bottom/side inlet versatility Adjustable height with 5mm precision Brass threading for 100,000+ cycles durability Ibergrif M20521 G3/8 inch (16mm) Toilet Inlet Valve, Bottom or Side Inlet, Float Valve **Brand:** ibergrif **Price:** $41.34 **Availability:** βœ… In Stock ## Summary > 🚽 Upgrade your flush game with precision & durability! ## Quick Answers - **What is this?** Ibergrif M20521 G3/8 inch (16mm) Toilet Inlet Valve, Bottom or Side Inlet, Float Valve by ibergrif - **How much does it cost?** $41.34 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/517476916-ibergrif-m20521-g3-8-inch-16mm-toilet-inlet-valve-bottom) ## Best For - ibergrif enthusiasts ## Why This Product - Trusted ibergrif brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** Premium ABS body paired with robust brass hex nuts ensures a leak-proof, corrosion-resistant valve built for over 100,000 uses. - β€’ **Clean Water Guarantee:** Integrated filter net traps impurities, protecting your toilet’s internal system and extending valve lifespan. - β€’ **Precision Water Control:** Easily adjust water level in 5mm increments to optimize flush efficiency and save water without sacrificing performance. - β€’ **DIY-Friendly Installation:** Complete kit with clear instructions and included water pipe makes setup so simple, anyone can do itβ€”no plumber needed. - β€’ **Universal Fit, Zero Hassle:** Fits both one-piece & two-piece toilets with bottom or side inlet options for ultimate installation flexibility. ## Overview The Ibergrif M20521 Toilet Inlet Valve offers versatile bottom or side inlet installation, adjustable water level control, and premium ABS and brass construction for long-lasting, reliable performance. Designed for easy DIY installation, it features a built-in filter to ensure clean water flow and is compatible with most dual flush toilet systems, making it a smart, durable upgrade for modern bathrooms. ## Description From the manufacturer Maximize toilet performance and save water! About Ibergrif Ibergrif is one of the leading manufacturers and suppliers of sanitary ware in Spain. With an uncompromising dedication to quality and a passion for lifestyle, we are producing products that perfectly meet to the needs and lifestyles of our customers. It is our goal to help customers live a more beautiful and affordable life. Find inspiration for your kitchen and bathroom with Ibergrif! WRAS Approved Long-life Easy to install Plastic & Brass Tight seal, adjustable height, strong flush! IBERGRIF M20521 bottom & side entry inlet valve is an excellent value, reliable solution. Available with 3/8 inch thread (M13-17) to fit almost any water supply and with it's adjustable height design, this valve can compatible with a variety of bottom or side entry toilet cisterns. Package include 1*toilet cistern fill valve 1* Water pipe 1*Instruction Sheet Bottom and side entry cisterns Adjustable water level Brass threading instead of plastic threading Bottom fill valve Inlet pipe with filter design, can effectively filter impurities in water. With side inlet The bottom inlet can be used if the side inlet is screwed. If the bottom inlet is screwed, water can be fed through the side. Buoy regulation Adjust the buoy height to accurately control the water level, 5mm per scale. Adjustable rod Water speed can be controlled by rotating adjusting lever. Brass threading Hexagon fastening nuts with brass interface, compared with plastic threading, increase longer service life. Very convenient Easy to install and use, even girls can handle it. Durable seal, robust design & Unique innovative water cut-off structure fix slow, noise, leak. Review: Good quality - Good quality toilet flush. I've using it more than a year. Works quite nicely. Review: Great product & easy to fit! - Fantastic replacement, easy to fit & better than the one that it replaced, job was all done & complete in about 30mins. ## Features - Two Installation Way: Compared to trational cistern fill valve, we can support bottom or side fill vlave, suitable for one-piece toilet or two-piece toilet. - Adjustable Height: Equipped with the main body latch, can adjust the water lavel, compatible with most dual flush toilet systems. - Effective Clean: The inlet adopts the filter net to effectively filter the impurities in the water. - Premium Material: Made of premium ABS material, rugged and durable, hexagon fastening nut made of brass material, the life has increased to 100,000 times. - Easy Installation: Package include 1*toilet cistern fill valve 1* Water pipe 1*Instruction Sheet, Girls can also install it easily. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BKSQ5VN1 | | Best Sellers Rank | 44,075 in DIY & Tools ( See Top 100 in DIY & Tools ) 42 in Toilet Tanks | | Brand | Ibergrif | | Connector Type | Slip | | Customer Reviews | 4.4 out of 5 stars 6,107 Reviews | | Exterior Finish | Brass | | Exterior finish | Brass | | Included Components | 1*toilet cistern fill valve 1* Water pipe 1*Instruction Sheet | | Inlet Connection Size | 0.38 Inches | | Inlet Connection Type | Tip solder at | | Inlet connection size | 0.38 Inches | | Inlet connection type | Tip solder at | | Item Dimensions | 28.5 x 13.3 x 6.9 centimetres | | Item Type Name | toilet cistern fill valve | | Item dimensions L x W x H | 28.5 x 13.3 x 6.9 centimetres | | Manufacturer | Ibergrif Griferias SL | | Material | Acrylonitrile Butadiene Styrene (ABS) | | Maximum Pressure | 16 Bars | | Model Number | M20521 | | Number of Pieces | 1 | | Number of Ports | 1 | | Outlet Connection Size | 0.38 Inches | | Outlet Connection Type | Barb | | Part Number | M20521 | | Set Name | Multi Color | | Size | 13.3 cm x 28.5 cm x 6.9 cm | | Smart Home Compatibility | Not Smart Home Compatible | | Specification Met | CE, ISI | | Thread Size | M12 x 1,75 und G3/8 Zoll | | Thread Type | Metric, Pipe | | Unit Count | 1.0 count | | Valve Type | Float Valve | ## Product Details - **Brand:** Ibergrif - **Exterior finish:** Brass - **Inlet connection size:** 0.38 Inches - **Inlet connection type:** Tip solder at - **Item dimensions L x W x H:** 28.5 x 13.3 x 6.9 centimetres - **Material:** Acrylonitrile Butadiene Styrene (ABS) - **Maximum operating pressure:** 16 Bars - **Number of ports:** 1 - **Outlet connection size:** 0.38 Inches - **Outlet connection type:** Barb ## Images ![Ibergrif M20521 G3/8 inch (16mm) Toilet Inlet Valve, Bottom or Side Inlet, Float Valve - Image 1](https://m.media-amazon.com/images/I/61pN3q+ulsL.jpg) ## Questions & Answers **Q: Is this suitable for high pressure?** A: we have a high pressure water in our house and seems to work fine. **Q: How long is the cable length?** A: I didn't measure it but probably about 15cm. Long enough to reach standard systern fitting. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good quality *by R***K on 19 April 2026* Good quality toilet flush. I've using it more than a year. Works quite nicely. ### ⭐⭐⭐⭐⭐ Great product & easy to fit! *by A***3 on 25 December 2025* Fantastic replacement, easy to fit & better than the one that it replaced, job was all done & complete in about 30mins. ### ⭐⭐⭐⭐ European fitting. *by A***R on 6 August 2024* I have a standard Irish toilet and I wanted to get a push button system instead of a lever (young kids, struggling to use it). Saw this at a great price and said I'd try it. It arrived the next day (I have Prime) and I went about installing it. All was going well until I came to the coupling plate (the silver bit that connects the cistern to the toilet) because this kit does not include the plate, and the one that is used on standard Irish toilets is too small. I COULD NOT get a plate to fit over the new fitting in any local plumbing supplier (as it is a EURO size) so I had to improve and make the hole on the old one a bit bigger with the help of the hacksaw. Once I got this sorted, it was a breeze. It works really well but perhaps the button push is a tad on the hard side to push. All in all, it's good but be aware of the dreaded coupling problem. ## Frequently Bought Together - Ibergrif M20521 Toilet Cistern Bottom Side Fill Valve Adjustable Telescopic Urinal Flush Valves Parts M13-17 (3/8") Plastic & Brass Multi Color - Close Coupling Kit for WC Toilet Pan Cistern Doughnut Fixings Plate Donut - SPARES2GO Toilet Cistern Seal Kit 100mm M6 Bolt Through 1.5" Rubber Dome 2" Foam Washer Set --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/517476916-ibergrif-m20521-g3-8-inch-16mm-toilet-inlet-valve-bottom](https://www.desertcart.us/products/517476916-ibergrif-m20521-g3-8-inch-16mm-toilet-inlet-valve-bottom) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-07-06*