--- product_id: 253973183 title: "519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, Black, 347" brand: "grundfos" price: "$83.85" currency: USD in_stock: true reviews_count: 5 category: "Grundfos" url: https://www.desertcart.us/products/253973183-519601-cast-iron-flange-set-for-up-series-circulator-pumps store_origin: US region: United States of America --- # 3/4-inch NPT pipe connection Includes 2 flanges, 2 gaskets, 4 bolts & nuts Durable cast iron build 519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, Black, 347 **Brand:** grundfos **Price:** $83.85 **Availability:** ✅ In Stock ## Summary > 🔧 Upgrade your pump game with the ultimate flange set—because your system deserves the best! ## Quick Answers - **What is this?** 519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, Black, 347 by grundfos - **How much does it cost?** $83.85 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/253973183-519601-cast-iron-flange-set-for-up-series-circulator-pumps) ## Best For - grundfos enthusiasts ## Why This Product - Trusted grundfos brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Rock-Solid Durability:** Cast iron construction ensures long-lasting reliability under pressure. - • **Leak-Proof Performance:** Engineered to prevent leaks, maintaining system integrity and peace of mind. - • **Precision Fit Guaranteed:** Designed specifically for Grundfos UP Series pumps with secure 3/4" NPT threaded connections. - • **Trusted by Professionals:** Highly rated with 4.7 stars from 372 users who demand quality and consistency. - • **Complete Installation Kit:** Includes all essential components—flanges, gaskets, bolts, and nuts—for a seamless setup. ## Overview The Grundfos 519601 Cast Iron Flange Set is a premium, durable accessory designed for seamless compatibility with Grundfos UP Series circulator pumps. Featuring a robust cast iron build, 3/4" NPT threaded connections, and a complete set of flanges, gaskets, bolts, and nuts, it ensures a secure, leak-proof installation trusted by professionals worldwide. ## Description Grundfos 519601 Cast Iron Flange Set is compatible with Grundfos UP Series Circulator Pumps. This kit includes (2) flanges, (2) gaskets and (4) bolts and nuts. Features NPT end connections and a 3/4" fitting size. Constructed of durable cast iron material. Check manufacturer recommendations to ensure a proper fit. Review: Todo bien con el producto, queremos compras mas artículos como este, en total de 102 artículos. Me pueden dar un mejor precio? Gracias Review: They do their job perfectly! The quality of the product is top of the line. I'm using it to pair it with my Grundfos water pump and it fit perfectly and hasn't leaked at all. You can tell this product is going to last. ## Features - Use with Versa Flo UP and UPS pumps - Pump connection GF 15/26 - 3/4-inch NPT pipe connection - Fitting is threaded for security - Includes 2 flanges, 2 gaskets, 2 bolts with nuts ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0012QGVRC | | Brand | Grundfos | | Color | Black | | Customer Reviews | 4.7 4.7 out of 5 stars (372) | | Fastener Type | bolts | | Finish Types | Black | | Global Trade Identification Number | 00632514009769 | | Included Components | Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps - 3/4" NPT | | Item Diameter | 0.75 Inches | | Item Dimensions | 5.1 x 5.1 x 5.1 centimeters | | Item Shape | Round | | Item Type Name | Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps - 3/4" NPT | | Item Weight | 0.01 Ounces | | Manufacturer | Grundfos | | Material Type | Cast Iron | | Number of Pieces | 6 | | Screw Head Style | Hex | | Size Name | 347 | | UPC | 783961374501 632514009769 | | Unit Count | 1 Count | ## Product Details - **Brand:** Grundfos - **Colour:** Black - **Item dimensions L x W x H:** 5.1 x 5.1 x 5.1 centimeters - **Material:** Cast Iron - **Size:** 347 ## Images ![519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, Black, 347 - Image 1](https://m.media-amazon.com/images/I/612MCDF08AL.jpg) ## Questions & Answers **Q: What isthe size of the bolts in this set?** A: I believe they were 1/2" x 2" **Q: What are the dimensions of these flanges? Specifically how far apart are the bolt holes?, And how big is diameter on short side?** A: The bolt holes are 3 1/8” Center to Center. The diameter of the two bolt holes are approximately 1/2”. They are about 5/16” from the edge of the flange. I hope this helps you. Mike **Q: My boiler has 1" input/output. Is there a 1" flange set?** A: Yes, please see the following. Grundfos 519602 1-Inch GF 15/26 Cast Iron Flange Set … ASIN: B0012QIZNU **Q: grundfos ups 26-99fc will this set work on this pump?** A: 3/4" GF 15/16 FLANGE SET, BRONZE, THREADED, PAIR, GRUNDFOS, Use with UP15-18SF, UP15-42SF, UP25-64SF, UP26-96BF, UP26-99BF YES ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by L***O on 21 August 2023* Todo bien con el producto, queremos compras mas artículos como este, en total de 102 artículos. Me pueden dar un mejor precio? Gracias ### ⭐⭐⭐⭐⭐ Review *by L***E on 21 June 2017* They do their job perfectly! The quality of the product is top of the line. I'm using it to pair it with my Grundfos water pump and it fit perfectly and hasn't leaked at all. You can tell this product is going to last. ### ⭐⭐⭐⭐⭐ Review *by S***I on 1 June 2024* wrong size 4 me ## Frequently Bought Together - Grundfos 519601 Cast Iron Flange Set for UP Series Circulator Pumps-3/4 NPT, 347, Black - Grundfos 59896341 UPS15-58FC Super Brute Circulator, Red, Small - 3-Speed Grundfos Pump Hot Water Circulator Pump Model UPS15-58FC; 115V --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/253973183-519601-cast-iron-flange-set-for-up-series-circulator-pumps](https://www.desertcart.us/products/253973183-519601-cast-iron-flange-set-for-up-series-circulator-pumps) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*