--- product_id: 131371220 title: "Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank" brand: "boltigen" price: "€ 23.37" currency: EUR in_stock: true category: "Boltigen" url: https://www.desertcart.pt/products/131371220-boltigen-compressor-sight-glass-1-2-npt-sturdy-brass-clear store_origin: PT region: Portugal --- # 300°C max temperature 1/2'' NPT threaded mount 725 PSI max pressure Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank **Brand:** boltigen **Price:** € 23.37 **Availability:** ✅ In Stock ## Summary > 🔍 See your system’s heartbeat with Boltigen’s crystal-clear sight glass! ## Quick Answers - **What is this?** Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank by boltigen - **How much does it cost?** € 23.37 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/131371220-boltigen-compressor-sight-glass-1-2-npt-sturdy-brass-clear) ## Best For - boltigen enthusiasts ## Why This Product - Trusted boltigen brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Versatile Compatibility:** Ideal replacement for air compressors, pumps, and tanks, making your equipment smarter and more efficient. - • **Pressure & Heat Toughened:** Engineered to withstand up to 725 PSI and 300°C, perfect for demanding compressor and pump environments. - • **Effortless DIY Installation:** Threaded 1/2'' NPT design with red thread sealant guarantees a leak-proof fit—no professional help needed. - • **Built to Last with Premium Brass:** Sturdy brass body ensures unmatched durability and corrosion resistance for long-term reliability. - • **Crystal Clear Tempered Glass Dome:** Provides a flawless, transparent view of oil or liquid levels, eliminating guesswork instantly. ## Overview The Boltigen Compressor Sight Glass is a robust 1/2'' NPT brass sight gauge featuring a premium tempered glass dome, designed to provide clear, reliable oil and liquid level monitoring. Rated for 725 PSI and 300°C, it offers superior durability and easy installation, making it the perfect upgrade for air compressors, pumps, and tanks. ## Description Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank - desertcart.com ## Features - 【Sturdy Brass Material】Boltigen 1/2 inch Male NPT air compressor sight glass is made of high quality brass, which make the compressor oil sight plug stonger & more durable; the dome window is made of premium transparent tempered glass, provide you with clear level view of your equipment - 【Product Standard】Boltigen 1/2'' NPT dome air compressor replacement sight window working pressure is：725 PSI (50 bar) ; working temperature is: 300 Celsius. Compared to original plastic sight glass, Boltigen brass sight gauge designed with new dome top, more beautiful and durable - 【Easy to Install】You can easily finish installation the Boltigen air compressor oil plug by thread screwing to connect your compressor、 pump、Tank; No need help. The red thread coating guarantees no leakage. Perfect replacement for air compressor - 【Wide Application】Boltigen 1/2 inch Male NPT coolant brass oil sight glass is perfect replacement for 60 gallon two stage vertical compressor、CH pump、Tank liquid level monitoring, making equipment work well; You deserve the Boltigen bulb air compressor oil level sight window - 【Customer Service】Boltigen 1/2'' Male NPT compressor oil sight glass has 12 months warranty, great friendly customer service, any question about the Boltigen tank oil level indicator, please let us know first time, we will be glad to help you ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07RYR7Z58 | | Best Sellers Rank | #266,793 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #903 in Air-Compressor Accessories | | Brand Name | Boltigen | | Color | gold | | Compatible Devices | Air Compressor, Pump, Tank | | Customer Reviews | 4.7 4.7 out of 5 stars (72) | | Item Display Weight | 41.5 g | | Lens Color | gold | | Manufacturer | Boltigen | | Manufacturer Part Number | AH1 | | Material Type | Brass | | Model Name | 1/2 inch NPT | | Mounting Type | Threaded Mount | | Number of Items | 1 | | Number of Packs | 1 | | Product Style | Modern | | Reticle Type | Cross | | Sport Type | Hunting | | Thread Type | NPT | | UPC | 653334755698 | | Unit Count | 1 Count | ## Product Details - **Brand:** Boltigen - **Color:** gold - **Compatible Devices:** Air Compressor, Pump, Tank - **Material:** Brass - **Mounting Type:** Threaded Mount - **Number of Packs:** 1 - **Sport:** Hunting - **Style:** Modern - **Thread Type:** NPT - **Weight:** 41.5 g ## Images ![Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank - Image 1](https://m.media-amazon.com/images/I/61eedsTYwIL.jpg) ![Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank - Image 2](https://m.media-amazon.com/images/I/71IMPqZQpPL.jpg) ![Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank - Image 3](https://m.media-amazon.com/images/I/71QMqFy+GML.jpg) ![Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank - Image 4](https://m.media-amazon.com/images/I/71zCFrijQvL.jpg) ![Boltigen Compressor Sight Glass, 1/2'' NPT Sturdy Brass Clear Dome Bulb Sight Gauge, Oil Level Site Glass, Tank Level Indicator Plug Window, Perfect Replacement for Air Compressor、Pump、Tank - Image 5](https://m.media-amazon.com/images/I/71RVJ7g2wdL.jpg) ## Available Options This product comes in different **Size, Item Package Quantity** options. ## Questions & Answers **Q: do thay make 1/4" NPT ?** A: No, it is 1/2 NPT oil sight glass **Q: Does this product have an IP rating?** A: Don’t know the rating. I’ve have got 20 psi on them before with out blowing out **Q: Hello, is this sight window suitable for automotive coolant (water/antifreeze mix)? The ad refers to automotive industries and only mentions oil.** A: Should be fine with water and coolant, it's brass and glass. Solved my leaky sight glass on a new compressor --- ## 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/131371220-boltigen-compressor-sight-glass-1-2-npt-sturdy-brass-clear](https://www.desertcart.pt/products/131371220-boltigen-compressor-sight-glass-1-2-npt-sturdy-brass-clear) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-02*