--- product_id: 253973181 title: "519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black" brand: "grundfos" price: "฿4207" currency: THB in_stock: true reviews_count: 5 category: "Grundfos" url: https://www.desertcart.co.th/products/253973181-519603-cast-iron-flange-set-for-up-series-circulator-pumps store_origin: TH region: Thailand --- # Complete kit: flanges, gaskets & bolts 1-1/4" NPT precision fit Durable cast iron build 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black **Brand:** grundfos **Price:** ฿4207 **Availability:** ✅ In Stock ## Summary > 🛠️ Upgrade your pump game with the ultimate flange set—because your system deserves the best! ## Quick Answers - **What is this?** 519603 Cast Iron Flange Set for UP Series Circulator Pumps-1-1/4 NPT, Black by grundfos - **How much does it cost?** ฿4207 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/253973181-519603-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 - • **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. Review: The flanges, gaskets and nuts and bolts are not including when purchasing the pump. I feel they should be!! Review: It was the right size. ## 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 | | Batteries Included? | No | | Batteries Required? | No | | Color | Black | | Customer Reviews | 4.8 4.8 out of 5 stars (23) | | Customer reviews | 4.8 4.8 out of 5 stars (23) | | Date First Available | 15 August 2013 | | Date First Available | 15 August 2013 | | Included components | Grundfos 519603 Cast Iron Flange Set for UP Series Circulator Pumps - 1-1/4" NPT | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Item Weight | 553 g | | Item model number | 519603 | | Item model number | 519603 | | Manufacturer | Grundfos | | Manufacturer | Grundfos | | Material | Cast Iron | | Part number | 519603 | | Product Dimensions | 20.32 x 10.16 x 15.24 cm; 553.38 g | | Product Dimensions | 20.32 x 10.16 x 15.24 cm; 553.38 g | | Size | 379 | ## Images ![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". ## Customer Reviews ### ⭐⭐⭐⭐⭐ Review *by K***C on 26 February 2026* The flanges, gaskets and nuts and bolts are not including when purchasing the pump. I feel they should be!! ### ⭐⭐⭐⭐⭐ Review *by J***A on 20 October 2024* It was the right size. ### ⭐⭐⭐⭐⭐ Review *by H***Y on 29 May 2024* Used these on Taco 007 pump. All good ## 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.co.th/products/253973181-519603-cast-iron-flange-set-for-up-series-circulator-pumps](https://www.desertcart.co.th/products/253973181-519603-cast-iron-flange-set-for-up-series-circulator-pumps) --- *Product available on Desertcart Thailand* *Store origin: TH* *Last updated: 2026-04-27*