--- product_id: 282147041 title: "TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb" brand: "tuna" price: "€ 57.42" currency: EUR in_stock: true category: "Tuna" url: https://www.desertcart.pt/products/282147041-tuna-2-pack-fm-approved-and-ul-cul-listed-fire store_origin: PT region: Portugal --- # K=5.6 flow coefficient 155°F (68°C) activation temp 1/2” NPT tapered thread TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb **Brand:** tuna **Price:** € 57.42 **Availability:** ✅ In Stock ## Summary > 🔥 Stay ahead of fire risks with precision-engineered protection! ## Quick Answers - **What is this?** TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb by tuna - **How much does it cost?** € 57.42 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/282147041-tuna-2-pack-fm-approved-and-ul-cul-listed-fire) ## Best For - tuna enthusiasts ## Why This Product - Trusted tuna brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Durable Bronze Build:** Corrosion-resistant bronze ensures long-lasting safety - • **Easy Installation Fit:** Standard 1/2” NPT tapered threading for seamless integration - • **Reliable K=5.6 Flow Rate:** Optimized water discharge for maximum fire suppression efficiency - • **Certified Safety Assurance:** FM Approved & UL/CUL Listed for trusted, code-compliant protection - • **Precision Thermal Activation:** Triggers exactly at 155°F to stop fires before they spread ## Overview The TUNA 2-pack fire sprinkler heads feature a 155°F (68°C) glass bulb that shatters to release water with a K-factor of 5.6, ensuring rapid and effective fire suppression. Constructed from durable bronze with 1/2” NPT tapered threading, these FM Approved and UL/CUL Listed sprinklers meet rigorous safety standards and are designed for reliable automatic fire protection in residential or commercial settings. ## Description During a fire conditions, the thermal-sensitive liquid in the glass bulb expands, causing the bulb to shatter, releasing the button and spring seal assembly. Water flowing through the sprinkler orifice strikes the sprinkler deflector, forming a uniform spray pattern to extinguish or control the fire.Temperature Rating: 155°F (68°C)Discharge Coefficient: K=5.6(U.S) /80(Metric) Nominal Orifice Size:1/2"(15mm) Maximum Working Pressure:175psi(12bar) Min. Operating Pressure: 7psi (0.48bar) Factory Hydrostatic Test: 100%@ 500psi (34.5bar) NPT: National Pipe Tapered is common in plumbing and some industrial uses. Sometimes referred to as pipe thread because PVC pipe and schedule 40 pipe are typically threaded in NPT. As its name implies this is a tapered thread so that the outside diameter of the male (ODM) gets smaller towards the end of the fitting and the inside diameter of the female narrows with depth. As the two fittings are threaded together the opposite tapers force thread friction and makes the seal without the use of a gasket. ## Features - FM Approved 3053441and UL / CUL listed EX6430. 1/2 " NPT (National National Pipe Thread) American thread fire sprinkler heads - Underwriter Laboratories Listed, UL(United States) and ULC(Canada) Listed - Nominal 5.6 K-Factor fire sprinkler heads, Dia5mm Glass Bulb Standard Response 155F 68C - Max working pressure 175psig /1.2Mpa(12 bar);Factory Hydrostatic Test 100%@ 500psig (3.4Mpa) - Automatic sprinklers of the frangible bulb type ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08NYGYCCW | | Best Sellers Rank | #231,409 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #332 in Automatic Irrigation Sprinkler Heads | | Brand Name | Tuna | | Customer Reviews | 4.8 4.8 out of 5 stars (19) | | Item Dimensions | 1.3 x 1.3 x 1.97 inches | | Manufacturer Part Number | NX023B2 | | Material Type | Bronze | | Maximum Flow Rate | 5.6 gpm | | Maximum Pressure | 175 psi | | Model Number | NX023 | | Style Name | Automatic | | UPC | 705124113376 | | Unit Count | 2 Count | ## Product Details - **Brand:** Tuna - **Item dimensions L x W x H:** 1.3 x 1.3 x 1.97 inches - **Material:** Bronze - **Maximum Pressure:** 175 psi - **Style:** Automatic ## Images ![TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb - Image 1](https://m.media-amazon.com/images/I/81K72fGEedL.jpg) ![TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb - Image 2](https://m.media-amazon.com/images/I/71UEIdtFC0L.jpg) ![TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb - Image 3](https://m.media-amazon.com/images/I/81OGNryucmL.jpg) ![TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb - Image 4](https://m.media-amazon.com/images/I/71THMArOZ8L.jpg) ![TUNA (2 Pack) FM Approved & UL/CUL Listed Fire Sprinkler Head Upright Spray | 1/2” NPT 155°F (68°C) K=5.6 K80 Dia5mm Glass Bulb Standard Response for Automatic Fire Sprinkler System Bronze Frangible Bulb - Image 5](https://m.media-amazon.com/images/I/81DJGSxPW9L.jpg) ## Frequently Bought Together - (2 Pack) FM Approved & UL/CUL Listed TUNA Fire Sprinkler Head Upright Spray 1/2” NPT 155°F (68°C) K=5.6 K80 Standard Response for Automatic Fire Sprinkler System Bronze - Metal Magery Fire Sprinkler Spare Cabinet 6 Head Box for 1/2" and 3/4" Sprinkler Heads - (2 Pack) FM Approved & UL/CUL Listed TUNA Fire Sprinkler Head Horizontal Sidewall Spray 1/2” NPT 155°F (68°C) K=5.6 Side Wall Spray K80 Standard Response for Automatic Fire Sprinkler System Chrome --- ## 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.pt/products/282147041-tuna-2-pack-fm-approved-and-ul-cul-listed-fire](https://www.desertcart.pt/products/282147041-tuna-2-pack-fm-approved-and-ul-cul-listed-fire) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-08-06*