--- product_id: 9566292 title: "4 Inch Sump Bottom Drain with Dome for Koi Fish Pond or Koi Fish Quarantine Tank Filtration, Pond Fitting" brand: "rtf" price: "2715 kr" currency: DKK in_stock: true reviews_count: 4 category: "Rtf" url: https://www.desertcart.dk/products/9566292-4-inch-sump-bottom-drain-with-dome-for-koi-fish store_origin: DK region: Denmark --- # Adjustable lid for custom fit Fits standard 4-inch pipework Proudly made in the UK 4 Inch Sump Bottom Drain with Dome for Koi Fish Pond or Koi Fish Quarantine Tank Filtration, Pond Fitting **Brand:** rtf **Price:** 2715 kr **Availability:** βœ… In Stock ## Summary > 🌊 Elevate your koi pond’s filtration game with precision and style! ## Quick Answers - **What is this?** 4 Inch Sump Bottom Drain with Dome for Koi Fish Pond or Koi Fish Quarantine Tank Filtration, Pond Fitting by rtf - **How much does it cost?** 2715 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/9566292-4-inch-sump-bottom-drain-with-dome-for-koi-fish) ## Best For - rtf enthusiasts ## Why This Product - Trusted rtf brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Durable Build:** Crafted from solid plastic for long-lasting performance in outdoor aquatic environments. - β€’ **Trusted Origin:** Manufactured in the UK, combining quality craftsmanship with reliable pond filtration technology. - β€’ **Customizable Control:** Adjustable lid lets you tailor the drain to your pond’s unique needs, ensuring optimal water flow. - β€’ **Seamless Integration:** Designed to fit standard 4-inch pipework with included adapter for hassle-free installation. - β€’ **Watertight Assurance:** Innovative collar keeps the membrane perfectly sealed, preventing leaks and maintaining pond health. ## Overview This 4-inch sump bottom drain with dome is engineered for koi ponds and quarantine tanks, featuring a solid plastic build, adjustable lid, and watertight collar. It fits standard 4-inch pipework with an included adapter, ensuring efficient gravity-fed filtration. Made in the UK, it offers durability and customizable installation for professional-grade pond maintenance. ## Description 4 inch outlet Sump Bottom Drain comes with adjustable lid and liner collar. Complete with screws. A bottom drain is used on a pond which has a gravity fed filter system. Water and pond waste leave the pond via the bottom drain, travel along a length of pipe, and into the pond’s filter. Bottom drains are located on the pond floor, and should be positioned in the deeper areas of the pond. Review: happy koi - very practical and easy to work with , very satisfied with product Review: Terrible wont fit 4"pipe. I am truly disapointed that desertcart sells this product - I am truly disappointed that desertcart sells this product that is different than advertised. will not fit 4-inch drainage pipe or 4" potable pressure pipe and there is no solution. ## Features - Solid Plastic - Fits standard 4 inch pipework, adapter included - Lid can be adjusted to suit application - Collar to keep membrane watertight - Made in UK ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B006TCI8YS | | Best Sellers Rank | #399,719 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #4,618 in Pond Equipment | | Brand | RTF | | Brand Name | RTF | | Color | Black | | Customer Reviews | 3.2 out of 5 stars 8 Reviews | | Included Components | Includes liner flange/ ring and screws | | Item Type Name | Sump Bottom Drain with Dome | | Item Weight | 3 Pounds | | Manufacturer | United Aquatics | | Manufacturer Part Number | Tec102 | | Material | Plastic | | Material Type | Plastic | | Model Number | Tec102 | | Power Source | Not Specified | | Product Style | Submersible | | Specific Uses For Product | Outside | | Style | Submersible | | UPC | 718122026418 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** RTF - **Color:** Black - **Item Weight:** 3 Pounds - **Manufacturer:** United Aquatics - **Material:** Plastic - **Power Source:** Not Specified - **Specific Uses For Product:** Outside - **Style:** Submersible - **UPC:** 718122026418 ## Images ![4 Inch Sump Bottom Drain with Dome for Koi Fish Pond or Koi Fish Quarantine Tank Filtration, Pond Fitting - Image 1](https://m.media-amazon.com/images/I/410l961-GLL.jpg) ## Questions & Answers **Q: Can you sell the sump drain cover separately?** A: Hello, Thanks for asking! They are not listed here but but we may be able to help you find this replacement part. Feel free to contact us. Dana at Practical Garden Ponds, 484-237-2080, Ext.1 **Q: what pump do I use with this drain?** A: Typically you would bring the piping from this bottom drain thru a pre-filter of some kind (as sophisticated Helix Settlement tank or Evolution Aqua Sieve is or as simple as an extra-large strainer basket) and then to an external pump that is pulling the water in. An example of a good external pump would be Helix, Performance Pro or Sequence for some examples. It is always a good idea to run your setup ideas past a seasoned pond professional BEFORE you build the pond so we can make suggestions and educate you a bit about what you need and what the expected results will be if you use different options. Using a bottom drain can make your pond very low maintenance, as long as it is done correctly. We have drawings and plans we can offer free of charge. Sincerely, Nate "at" Practical Garden Ponds ... 484-237-2080 ## Customer Reviews ### ⭐⭐⭐⭐ happy koi *by F***J on September 16, 2024* very practical and easy to work with , very satisfied with product ### ⭐ Terrible wont fit 4"pipe. I am truly disapointed that amazon sells this product *by R***O on January 27, 2023* I am truly disappointed that amazon sells this product that is different than advertised. will not fit 4-inch drainage pipe or 4" potable pressure pipe and there is no solution. ### ⭐ Does not fit *by A***R on May 4, 2020* Does not fit 4 inch pipe do not buy the sizes on this are metric ## Frequently Bought Together - 4 Inch Sump Bottom Drain with Dome for Koi Fish Pond or Koi Fish Quarantine Tank Filtration, Pond Fitting - Valterra 4" PVC Gate Valve, slip/hub fittings with stainless steel paddle for Koi/Slurry Ponds, Aquaculture, Sewer lines & more, White (6401) - DreamPond Flanged Connector SxFIPT - 2" --- ## 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.dk/products/9566292-4-inch-sump-bottom-drain-with-dome-for-koi-fish](https://www.desertcart.dk/products/9566292-4-inch-sump-bottom-drain-with-dome-for-koi-fish) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-05-23*