--- product_id: 312592733 title: "Rain Harvesting Downspout First Flush Diverter Kit, 3\"" brand: "rain harvesting" price: "NT$11763" currency: TWD in_stock: true reviews_count: 5 category: "Rain Harvesting" url: https://www.desertcart.tw/products/312592733-rain-harvesting-downspout-first-flush-diverter-kit-3 store_origin: TW region: Taiwan --- # slow-release valve for timed drainage 3" pipe compatible NSF 61 certified contaminant barrier Rain Harvesting Downspout First Flush Diverter Kit, 3" **Brand:** rain harvesting **Price:** NT$11763 **Availability:** βœ… In Stock ## Summary > πŸ’§ Capture the cleanest rainβ€”because your water deserves the first flush! ## Quick Answers - **What is this?** Rain Harvesting Downspout First Flush Diverter Kit, 3" by rain harvesting - **How much does it cost?** NT$11763 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/312592733-rain-harvesting-downspout-first-flush-diverter-kit-3) ## 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€’ **Certified Safety:** Meets NSF 61 standards ensuring water quality you can trust - β€’ **Compact & Durable:** Sleek PVC design fits discreetly while standing up to the elements - β€’ **Effortless Maintenance:** Slow-release valve drains chamber for hassle-free prep between rains - β€’ **Seamless 3" Integration:** Designed to fit standard 3-inch downspouts for easy installation - β€’ **Pure Rainwater, Every Time:** Automatically diverts first flush to keep your tank pristine ## Overview The Rain Harvesting Downspout First Flush Diverter Kit is a compact, NSF 61 certified PVC system designed to divert the initial contaminated runoff from your 3" downspout before it reaches your rainwater tank. Featuring a slow-release valve, it automatically drains the chamber to stay ready for the next rainfall, ensuring consistently high-quality water collection with minimal maintenance. ## Description Keep contaminants out of your rainwater supply with the Rain Harvesting First Flush Downspout. Equipped with a slow-release valve, this system automatically drains the chamber over time, keeping it ready for the next rainfall. The First Flush Basic comes with everything you need for installation, requiring only the addition of a 3" pipe for the chamber. Boasting an efficient design, this first flush will prevent both organic and inorganic contaminants getting into your water tank, and ensure a high standard of quality in the final collection tank. Review: First flush - I bought 2 of these and they work great, depending on the amount of rain you get, make sure you change out the rubber washer to make sure it drains fast enough! Great product! Review: That you can't use it! - Just bought this unit, looks and sounds great but you can't buy the pipe or fittings to go with it in the uk so a compleate waist of money! ## Features - Kit does NOT include the middle shaft - Divert the first flush of rain water before it goes to your tank - International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001OWG6BU | | Best Sellers Rank | #176,662 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #53 in Roofing Gutters | | Brand | Rain Harvesting | | Brand Name | Rain Harvesting | | Color | White | | Colour | White | | Customer Reviews | 4.4 out of 5 stars 247 Reviews | | Item Dimensions L x W x H | 10.2L x 15.2W x 20.3H centimeters | | Manufacturer | Rainharvesting | | Manufacturer Part Number | WDDS99 | | Material | Polyvinyl Chloride (PVC) | | Material Type | Polyvinyl Chloride (PVC) | | Model Number | WDDS99 | | Product dimensions | 10.2L x 15.2W x 20.3H centimeters | | Shape | Cylindrical | | Specification Met | National Sanitation Foundation 61 | | Specification met | National Sanitation Foundation 61 | | Unit Count | 1 Count | ## Product Details - **Brand:** Rain Harvesting - **Colour:** White - **Material:** Polyvinyl Chloride (PVC) - **Product dimensions:** 10.2L x 15.2W x 20.3H centimeters - **Specification met:** National Sanitation Foundation 61 ## Images ![Rain Harvesting Downspout First Flush Diverter Kit, 3" - Image 1](https://m.media-amazon.com/images/I/41g8s76RJuL.jpg) ![Rain Harvesting Downspout First Flush Diverter Kit, 3" - Image 2](https://m.media-amazon.com/images/I/31slASOvgNL.jpg) ![Rain Harvesting Downspout First Flush Diverter Kit, 3" - Image 3](https://m.media-amazon.com/images/I/21ceEiCfhcL.jpg) ![Rain Harvesting Downspout First Flush Diverter Kit, 3" - Image 4](https://m.media-amazon.com/images/I/41ItUHEHmmL.jpg) ![Rain Harvesting Downspout First Flush Diverter Kit, 3" - Image 5](https://m.media-amazon.com/images/I/41urvd2WJEL.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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ First flush *by J***D on 25 April 2026* I bought 2 of these and they work great, depending on the amount of rain you get, make sure you change out the rubber washer to make sure it drains fast enough! Great product! ### ⭐ That you can't use it! *by A***. on 28 November 2025* Just bought this unit, looks and sounds great but you can't buy the pipe or fittings to go with it in the uk so a compleate waist of money! ### ⭐⭐⭐⭐⭐ Innovative Part to Enable Rain Catchment! *by C***Y on 7 May 2026* Works very well for our rain catchment system! ## 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.tw/products/312592733-rain-harvesting-downspout-first-flush-diverter-kit-3](https://www.desertcart.tw/products/312592733-rain-harvesting-downspout-first-flush-diverter-kit-3) --- *Product available on Desertcart Taiwan* *Store origin: TW* *Last updated: 2026-07-13*