---
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: "R395"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Boltigen"
url: https://www.desertcart.co.za/products/131371220-boltigen-compressor-sight-glass-1-2-npt-sturdy-brass-clear
store_origin: ZA
region: South Africa
---

# Tempered Clear Dome Glass 1/2'' Male NPT Threaded Mount 725 PSI Pressure Rating 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:** R395
**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?** R395 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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

- • **Pressure & Heat Toughened:** Engineered to withstand up to 725 PSI and 300°C, perfect for demanding industrial environments.
- • **Effortless DIY Installation:** Threaded 1/2'' NPT design with red thread sealant guarantees a leak-proof, no-hassle setup.
- • **Versatile & Trusted Replacement:** Ideal for air compressors, pumps, and tanks—join thousands of pros upgrading their equipment with Boltigen.
- • **Built to Last with Premium Brass:** Sturdy brass body ensures unmatched durability and corrosion resistance for long-term reliability.
- • **Crystal Clear Oil Level Monitoring:** Tempered transparent dome glass offers a flawless view of your compressor or tank fluid levels at a glance.

## Overview

The Boltigen Compressor Sight Glass is a robust 1/2'' NPT brass sight gauge featuring a premium tempered glass dome for clear fluid level visibility. Rated for 725 PSI and 300°C, it offers durable, leak-proof monitoring for air compressors, pumps, and tanks. Easy to install and built to last, it’s the professional’s choice for reliable equipment maintenance.

## 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

Review: Great quality product, several uses - Great quality product. I used as a sight window to my outside electrical panel as a way to see the indicator light on my whole house surge protector. Crystal clear, and water/fluid proof. Works great for the way I repurposeed it.
Review: Like insurance for my trucks. - It takes seconds to lift your eyes and see the top radiator tank has water in the morning. Many drivers are to lazy to climb the side ladder on 30 ton water trucks, remove a cap and check the water level. I'm sure anyone could guess the results of running a Cummins without water & overheating the engine. Anyway, the drivers have said it saves time in the morning and for the small cost it could save hundreds of thousands in motor repairs, down time & lost contracts. These sight glasses are great & I highly recommend them. P.S. The green water stands out so bright I'll know if the additive has been overlooked on servicing.

## 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 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #256,251 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #916 in Air-Compressor Accessories |
| Brand | Boltigen |
| Color | gold |
| Customer Reviews | 4.7 4.7 out of 5 stars (67) |
| Date First Available | May 21, 2019 |
| Finish | Original |
| Item Package Quantity | 1 |
| Item Weight | 1.58 ounces |
| Manufacturer | Boltigen |
| Material | Brass |
| Model Name | 1/2 inch NPT |
| Mounting Type | Threaded Mount |
| Night vision | No |
| Number Of Pieces | 1 |
| Package Dimensions | 2.1 x 2 x 0.7 inches |
| Part Number | AH1 |
| Reticle Type | Cross |
| Shape | Plug |
| Size | 1/2 inch |
| Sport | Hunting |
| Style | Modern |
| Thread Type | Male |
| UPC | 653334755698 |
| Weight | 41.5 Grams |

## Product Details

- **Brand:** Boltigen
- **Color:** gold
- **Material:** Brass
- **Model Name:** 1/2 inch NPT
- **Mounting Type:** Threaded Mount
- **Night vision:** No
- **Sport:** Hunting
- **Style:** Modern
- **Thread Type:** Male
- **Weight:** 41.5 Grams

## 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)

## 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great quality product, several uses
*by T***Y on November 7, 2025*

Great quality product. I used as a sight window to my outside electrical panel as a way to see the indicator light on my whole house surge protector. Crystal clear, and water/fluid proof. Works great for the way I repurposeed it.

### ⭐⭐⭐⭐⭐ Like insurance for my trucks.
*by M***X on December 10, 2019*

It takes seconds to lift your eyes and see the top radiator tank has water in the morning. Many drivers are to lazy to climb the side ladder on 30 ton water trucks, remove a cap and check the water level. I'm sure anyone could guess the results of running a Cummins without water & overheating the engine. Anyway, the drivers have said it saves time in the morning and for the small cost it could save hundreds of thousands in motor repairs, down time & lost contracts. These sight glasses are great & I highly recommend them. P.S. The green water stands out so bright I'll know if the additive has been overlooked on servicing.

### ⭐⭐⭐⭐⭐ Works as advertised
*by C***C on May 22, 2022*

I needed something to indicate air pockets in my latest experimental solar thermal system. These do the trick. It can be hard to see if there is liquid or air, when the liquid isn't colored. The way I mounted them, about 1/3 water remains when the water is gone. Hence I can see the air, when it is 2/3 air and 1/3 water. Unless you use a colored liquid, you might want to consider that.

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-14*