--- product_id: 253973181 title: "Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black" brand: "grundfos" price: "¥11329" currency: JPY in_stock: true category: "Grundfos" url: https://www.desertcart.jp/products/253973181-grundfos-519603-cast-iron-flange-set-for-up-series-circulator store_origin: JP region: Japan --- # Complete kit: flanges, gaskets & bolts 1-1/4" NPT precision fit Durable cast iron build Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black **Brand:** grundfos **Price:** ¥11329 **Availability:** ✅ In Stock ## Summary > 🛠️ Upgrade your pump game with the ultimate flange set—because your system deserves the best! ## Quick Answers - **What is this?** Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black by grundfos - **How much does it cost?** ¥11329 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/253973181-grundfos-519603-cast-iron-flange-set-for-up-series-circulator) ## 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 - • **Precision Engineered Fit:** Seamlessly compatible with Grundfos UP Series pumps for hassle-free installation. - • **Trusted by Professionals:** Highly rated with 4.8 stars from industry users who demand quality and consistency. - • **Optimized for Performance:** NPT end connections guarantee leak-proof, secure plumbing integration. - • **All-in-One Installation Kit:** Includes 2 flanges, 2 gaskets, and 4 bolts & nuts—everything you need to upgrade your system. - • **Robust Cast Iron Durability:** Built to last with premium cast iron, ensuring long-term reliability under pressure. ## Overview The Grundfos 519603 Cast Iron Flange Set is a premium plumbing accessory designed for 1-1/4" NPT connections, perfectly compatible with Grundfos UP Series circulator pumps. This durable kit includes two cast iron flanges, gaskets, and all necessary bolts and nuts, ensuring a secure, leak-resistant installation. Trusted by professionals and backed by excellent reviews, it’s the essential upgrade for reliable pump performance. ## Description Grundfos 519603 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 1-1/4" fitting size. Constructed of durable cast iron material. Check manufacturer recommendations to ensure a proper fit. ## Features - Fitting Size: 1-1/4" NPT - NPT end connections - Compatible with Grundfos UP Series Circulator Pumps - Kit includes (2) flanges, (2) gaskets and (4) bolts and nuts - Check manufacturer recommendations to ensure a proper fit ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0039PO22K | | ASIN | B0039PO22K | | Brand Name | Grundfos | | Color | Black | | Connector Type | NPT | | Customer Reviews | 4.8 4.8 out of 5 stars (22) | | Customer reviews | 4.8 4.8 out of 5 stars (22) | | Date First Available | 15 August 2013 | | Global Trade Identification Number | 00632514024649 | | Included Components | Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT | | Is Discontinued By Manufacturer | No | | Item Dimensions | 20.3 x 10.2 x 15.2 centimeters | | Item Type Name | Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT | | Item Weight | 1.22 Pounds | | Item model number | 519603 | | Manufacturer | Grundfos | | Manufacturer | Grundfos | | Manufacturer Part Number | 519603 | | Material Type | Cast Iron | | Model Number | 519603 | | Number of Pieces | 8 | | Product Dimensions | 20.32 x 10.16 x 15.24 cm; 553.38 g | | Set Name | Grundfos UP Series Circulator Pumps Flange Set (2 Flanges, 2 Gaskets, 4 Bolts and Nuts) | | Size | 379 | | Thread Size | 1-1/4" NPT | | Thread Type | NPT | | UPC | 632514024649 735090478179 | | Unit Count | 1 Count | ## Product Details - **Brand:** Grundfos - **Colour:** Black - **Item dimensions L x W x H:** 20.3 x 10.2 x 15.2 centimeters - **Material:** Cast Iron - **Size:** 379 ## Images ![Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black - Image 1](https://m.media-amazon.com/images/I/61luHiue4dL.jpg) ## Questions & Answers **Q: What is the distance between the bolt holes ? Thanks** A: Center to center is 3-1/4" for the Grundfos flanges. **Q: What is the total lenght of the flange ? Thanks** A: Total length of the Grundfos flange is 4-1/4". The holes center to center is 3-1/4". ## Frequently Bought Together - Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black - Grundfos 59896341 UPS15-58FC Super Brute Circulator, Red, Small - HYDRO MASTER Universal Pump Flange Gasket (Set of 2) --- ## 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.jp/products/253973181-grundfos-519603-cast-iron-flange-set-for-up-series-circulator](https://www.desertcart.jp/products/253973181-grundfos-519603-cast-iron-flange-set-for-up-series-circulator) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-09-04*