--- product_id: 48847004 title: "CALEFFI PRESSURE RELIEF VALVE 3/4\" LOOSE NUT TO 1/2\" BSP 6 BAR 311501" brand: "caleffi" price: "$71.53" currency: USD in_stock: true reviews_count: 8 category: "Caleffi" url: https://www.desertcart.us/products/48847004-caleffi-pressure-relief-valve-3-4-loose-nut-to-1 store_origin: US region: United States of America --- # 3/4" to 1/2" BSP thread fit Install in under 20 mins 6 Bar max pressure CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 **Brand:** caleffi **Price:** $71.53 **Availability:** βœ… In Stock ## Summary > πŸ”§ Pressure perfected, installation perfected β€” don’t get left behind! ## Quick Answers - **What is this?** CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 by caleffi - **How much does it cost?** $71.53 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/48847004-caleffi-pressure-relief-valve-3-4-loose-nut-to-1) ## Best For - caleffi enthusiasts ## Why This Product - Trusted caleffi brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Durable Stainless Steel Finish:** Engineered to resist corrosion and maintain peak performance over time. - β€’ **Reliable 6 Bar Pressure Control:** Safeguard your system with precision pressure relief designed for optimal safety and performance. - β€’ **Trusted Brand with Proven Quality:** Join thousands of professionals who rely on Caleffi’s 4.7-star rated valve for peace of mind. - β€’ **Quick & Tool-Efficient Installation:** Get your system back online fast with just one adjustable wrenchβ€”no plumber needed. - β€’ **Universal 3/4" to 1/2" BSP Compatibility:** Seamlessly fits standard plumbing setups for hassle-free replacement and upgrades. ## Overview The Caleffi Pressure Relief Valve 311501 is a high-quality, stainless steel valve designed to safely regulate system pressure up to 6 bars. Featuring a 3/4" loose nut to 1/2" BSP thread connection, it offers quick, tool-efficient installation ideal for direct replacements. Backed by a 12-month warranty and a 4.7-star rating from over 140 users, this valve ensures reliable performance and durability for professional-grade plumbing systems. ## Description Caleffi Pressure Relief Valve 3 4 Loose Nut To 1 2 Bsp 6 Bar 311501 Review: Quick and easy to fit direct replacement. - Genuine quality item. Caleffi Pressure Relief Valve 6-Bar. Ensure your water is off at the main stopcock and the pressure has released from your system - we opened the cold taps to ensure this. plenty of towels at the ready around the area "just in case" but there was only a minor trickle when I removed the original defective unit. Cleaned the surface of the pipework to make sure the 2 would create a seal. Joined and tightened on both sides. Gently brought the water back up to normal pressure and checked for [no] drips. Job done! Allow an hour, but it could be done within 20 mins. Only One tool required for the job. I used an adjustable Wide-Jaw wrench/spanner similar to this one https://amzn.eu/d/j3FKatZ As a Prime member it arrived the same day! Review: Cost effective solution - Good solution to replace failed valve without having to change the full valve assembly ## Features - CALEFFI PRESSURE RELIEF VALVE 3 4 LOOSE NUT TO 1 2 BSP 6 BAR 311501 - Brand : Caleffi - Product type: VALVE ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01GFTLTG8 | | Best Sellers Rank | 35,413 in DIY & Tools ( See Top 100 in DIY & Tools ) 33 in Water Heaters & Parts | | Brand | Caleffi | | Customer Reviews | 4.7 out of 5 stars 141 Reviews | | Exterior Finish | Stainless Steel | | Exterior finish | Stainless Steel | | Inlet Connection Size | 1/2 Inches | | Inlet Connection Type | Female Iron Pipe | | Inlet connection size | 1/2 Inches | | Inlet connection type | Female Iron Pipe | | Manufacturer | Caleffi | | Manufacturer Warranty Description | 12 months. | | Material | Metal | | Maximum Pressure | 6 Bars | | Model Number | 311501 | | Number of Items | 1 | | Number of Packs | 1 | | Number of Ports | 6 | | Outlet Connection Type | BSPT | | Outlet connection type | BSPT | | Part Number | 311501 | | Size | 3/4 inches | | Specification Met | CE | | Thread Size | 3/4 inches | | Thread Type | NPT | | Unit Count | 1.0 count | | Valve Type | Pressure Relief Valve | ## Product Details - **Brand:** Caleffi - **Exterior finish:** Stainless Steel - **Inlet connection size:** 1/2 Inches - **Inlet connection type:** Female Iron Pipe - **Material:** Metal - **Maximum operating pressure:** 6 Bars - **Number of Packs:** 1 - **Number of ports:** 6 - **Outlet connection type:** BSPT - **Specification met:** CE ## Images ![CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 - Image 1](https://m.media-amazon.com/images/I/4124hGDsxEL.jpg) ![CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 - Image 2](https://m.media-amazon.com/images/I/41Vuyqc3WLL.jpg) ![CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 - Image 3](https://m.media-amazon.com/images/I/41QR++mUYLL.jpg) ![CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 - Image 4](https://m.media-amazon.com/images/I/41Me4U1hFGL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Quick and easy to fit direct replacement. *by A***S on 24 June 2025* Genuine quality item. Caleffi Pressure Relief Valve 6-Bar. Ensure your water is off at the main stopcock and the pressure has released from your system - we opened the cold taps to ensure this. plenty of towels at the ready around the area "just in case" but there was only a minor trickle when I removed the original defective unit. Cleaned the surface of the pipework to make sure the 2 would create a seal. Joined and tightened on both sides. Gently brought the water back up to normal pressure and checked for [no] drips. Job done! Allow an hour, but it could be done within 20 mins. Only One tool required for the job. I used an adjustable Wide-Jaw wrench/spanner similar to this one https://amzn.eu/d/j3FKatZ As a Prime member it arrived the same day! ### ⭐⭐⭐⭐⭐ Cost effective solution *by J***. on 17 June 2025* Good solution to replace failed valve without having to change the full valve assembly ### ⭐⭐⭐⭐⭐ Good *by T***Y on 14 August 2026* Works ## Frequently Bought Together - CALEFFI PRESSURE RELIEF VALVE 3/4" LOOSE NUT TO 1/2" BSP 6 BAR 311501 - Altecnic Pressure and Temperature Relief Valve 7Bar 1/2 Tpr15 - Caleffi - 22mm Inlet Control Multibloc Valve Group 533002CST --- ## 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.us/products/48847004-caleffi-pressure-relief-valve-3-4-loose-nut-to-1](https://www.desertcart.us/products/48847004-caleffi-pressure-relief-valve-3-4-loose-nut-to-1) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-09-25*