--- product_id: 5802354 title: "Rain Harvesting First Flush Downspout - First Flush Diverter Kit, Suits 3\" Round Pipes" brand: "rain harvesting" price: "Β£69.61" currency: GBP in_stock: false url: https://www.desertcart.co.uk/products/5802354-rain-harvesting-first-flush-downspout-first-flush-diverter-kit-suits store_origin: GB region: United Kingdom --- # First flush diverts initial runoff Auto-draining slow release valve Customizable diversion volume Rain Harvesting First Flush Downspout - First Flush Diverter Kit, Suits 3" Round Pipes **Brand:** rain harvesting **Price:** Β£69.61 **Availability:** ❌ Out of Stock ## Summary > πŸ’§ Capture the cleanest rain, effortlessly and smartly! ## Quick Answers - **What is this?** Rain Harvesting First Flush Downspout - First Flush Diverter Kit, Suits 3" Round Pipes by rain harvesting - **How much does it cost?** Β£69.61 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/5802354-rain-harvesting-first-flush-downspout-first-flush-diverter-kit-suits) ## Best For - rain harvesting enthusiasts ## Why This Product - Trusted rain harvesting brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Plug & Play Setup:** Includes all installation essentialsβ€”just add your 3" pipe and go. - β€’ **Durable & Lightweight:** Crafted from sturdy polypropylene, designed to last without weighing you down. - β€’ **Hands-Free Maintenance:** Auto-draining valve empties the chamber automatically, prepping for the next rain. - β€’ **Purest Rainwater Capture:** Diverts first runoff to ensure only the cleanest water enters your system. - β€’ **Tailored Water Management:** Easily adjust pipe length to customize your first flush volume for optimal efficiency. ## Overview The Rain Harvesting First Flush Downspout Diverter Kit is a compact, easy-to-install system designed for 3" round pipes. It diverts the initial runoff to ensure only the highest quality rainwater is collected, features an automatic slow-release valve for hassle-free draining, and allows customizable diversion volume by adjusting pipe length. Made from durable polypropylene, it offers a lightweight yet robust solution for efficient rainwater harvesting. ## Description Rain Harvesting First Flush Downspout - First Flush Diverter Kit, Suits 3" Round Pipes ## Features - FIRST FLUSH: Divert the initial runoff to ensure only the highest quality water is captured. - AUTO DRAINING: Featuring a slow release valve which will automatically drain the chamber ready for the next rainfall. - JUST ADD PIPE: The First Flush with Catch All Tee includes everything you need to install - just add 3" pipe for the chamber. - CUSTOMIZE YOUR DIVERSION VOLUME: The system is easily customised by adding the length of pipe to suit your first flush requirements. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001OWG6BU | | Batteries Included? | No | | Batteries Required? | No | | Best Sellers Rank | #149,629 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #71 in Gutter Downspouts | | Brand | Rain Harvesting | | Color | White | | Customer Reviews | 4.4 4.4 out of 5 stars (243) | | Date First Available | January 3, 2009 | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Item Weight | 1.65 pounds | | Item model number | WDDS99 | | Manufacturer | Rainharvesting | | Material | Polypropylene (PP) | | Part Number | WDDS99 | | Product Dimensions | 4"L x 6"W x 8"H | | Shape | Cylindrical | ## Product Details - **Brand:** Rain Harvesting - **Color:** White - **Material:** Polypropylene (PP) - **Product Dimensions:** 4"L x 6"W x 8"H - **Shape:** Cylindrical ## Images ![Rain Harvesting First Flush Downspout - First Flush Diverter Kit, Suits 3" Round Pipes - Image 1](https://m.media-amazon.com/images/I/41g8s76RJuL.jpg) ## Questions & Answers **Q: How does this system work with standard 2x3 aluminum downspouts? I currently have Oatey diverter installed but wanted to add a first flush system** A: It will certainly work but you need other parts...like this...http://www.amazon.com/InvisaFlow-4400-Grate-Downspout-Filter/dp/B0061Q5DW2/ref=pd_sim_lg_8?ie=UTF8&refRID=12SVWE9CH475G0A0P16W You definitely want a filter above the unit. Here is another one http://www.amazon.com/Rain-Harvesting-Pty-Ltd-Advanced/dp/B004VMG05C/ref=sr_1_4?ie=UTF8&qid=1430844792&sr=8-4&keywords=First+Flush **Q: Can the ball get lodged in the tube by debris?** A: If debris is large it is possible. The 3" first flush is a bit tighter than the 4". Do know this, smaller debris will clog the screen at the bottom before the ball will get lodged, this will make prevent/slow the initial bad water from draining properly. Also consider the amount of water you need to flush based on roof surface area flowing to the flush. Reduce debris that could clog the system with gutter guards not expensive and just put them on the gutters feeding the capture system. This will also help with the routine maintenance, you need to clean it out the sediment/small debris to keep it working at it's best. If you were wondering why you see fine screens offered with the system. Fine screen keeps small debris out of the drain screen allowing better draining and longer intervals between cleaning. Picking little twigs, pine needles and stems of leaves out of the drain screen supplied with the system is no fun. The fine mesh over this is a plus in so many ways. Hope this helps and good luck. **Q: Do you have any drawings or illustrations available on how this is installed and how it works?** A: Yes, we do, but you will need to email us through Amazon support so that we can email you the attachments that you need. As there is no way to provide an attachment here. **Q: Where can I buy extra filter to fit in 3inch pvc pipe?** A: You would need to reach out the manufacturer for help with this, they are good at taking care of these requests, we do not carry extra parts. ## Frequently Bought Together - Downspout First Flush Diverter Kit, 3" - Leaf Eater Advanced Rain Harvesting RHAD100 Both 3" and 4" Compatible - Rain Harvesting Tank Gauge, Tank-Top Water Level Monitoring Device for Rain Water Catching Systems --- ## 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.co.uk/products/5802354-rain-harvesting-first-flush-downspout-first-flush-diverter-kit-suits](https://www.desertcart.co.uk/products/5802354-rain-harvesting-first-flush-downspout-first-flush-diverter-kit-suits) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-26*