---
product_id: 664499340
title: "1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank"
brand: "fanovo"
price: "€ 36.91"
currency: EUR
in_stock: true
reviews_count: 8
category: "Fanovo"
url: https://www.desertcart.sk/products/664499340-1-2-npt-male-304-stainless-steel-oil-sight-glass
store_origin: SK
region: Slovakia
---

# 800 PSI Pressure Rated Operates -30°C to 120°C 304 Stainless Steel Durability 1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank

**Brand:** fanovo
**Price:** € 36.91
**Availability:** ✅ In Stock

## Summary

> 🔍 See Your Oil Like a Pro — Never Miss a Beat in Performance!

## Quick Answers

- **What is this?** 1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank by fanovo
- **How much does it cost?** € 36.91 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/664499340-1-2-npt-male-304-stainless-steel-oil-sight-glass)

## Best For

- fanovo enthusiasts

## Why This Product

- Trusted fanovo brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Industrial-Grade 304 Stainless Steel:** Built to resist wear, corrosion, and high temperatures for long-lasting reliability.
- • **High Pressure & Temperature Tolerance:** Certified to withstand up to 800 PSI and extreme temperatures from -30°C to 120°C.
- • **Precision Visual Oil Level Monitoring:** 3mm thick glass window offers crystal-clear, real-time liquid level inspection.
- • **Universal 1/2'' NPT Thread Compatibility:** Seamlessly fits standard air compressors, gearboxes, hydraulic tanks, and more.
- • **Quality Assured with 100% Inspection & Warranty:** Every unit undergoes rigorous QC with a full refund guarantee on defects.

## Overview

This 1/2'' NPT Male Oil Sight Glass is crafted from premium 304 stainless steel, engineered to deliver durable, corrosion-resistant performance in demanding environments. Featuring a robust 3mm thick glass window, it provides precise visual monitoring of oil levels under pressures up to 800 PSI and temperatures ranging from -30°C to 120°C. Ideal for air compressors, gearboxes, and hydraulic tanks, it ensures seamless integration with standard fittings and comes backed by stringent quality control and a satisfaction guarantee.

## Description

The sight glass plug is a kind of liquid indicator used in tanks, air compressors, pumps, piping systems, automotive industries, lab equipment, bearing housing and mixers, etc. The sight glass gauge has a good viewport for visual Inspection of water, oil, and gas (WOG). Specification: Material: 304 stainless steel Color: Silver Size: As the picture shows Package includes: 1/2 NPT sight glass How to Use: The actual liquid level position screw oil in the oil tank can be placed on the tank sight glass to see, to judge from the outside to run defenders screw oil meets the operating condition. Warm note: Get your air compressor shut down and pressure relief when change oil level sight glass. Manual measurement, please allow slight errors on size. The colors may exist slight difference due to different screens.

Review: High Quality 304 Stainless Steel Oil Sight Glass - I recently bought the 3/4" NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank and was really impressed with the quality of the product. It was relatively easy to install and the 304 Stainless Steel material is very durable and reliable. I would highly recommend this product to anyone looking for a reliable and long-lasting oil sight glass.
Review: They look good - Still in my toolbox, never used

## Features

- 【MATERIAL】The main body is made of 304 stainless steel, which is not easy to wear and burst compares to plastic material. It can work in a high-temperature environment
- 【Temperature & Pressure】Stainless steel oil sight glass gauge can work under pressure 800 PSI (55 bar) and temperature -30-120C(-22-248F). The sight window is qualified to pass strict pressure and temperature tests by our factory.
- 【THREAD PROTECTION AND DURABLE】Thread of oil level sight glass are 1 Inch MNPT. The thickness of the sight gauge is 3mm you can easily observe the change of the oil by the glass sight window.
- 【WIDELY APPLICATION】Oil level sight glass used widely to check the oil level of the pump in the air compressor. The actual liquid level position screw oil in the oil tank can be placed on the tank sight glass to see, to judge from the outside to run defenders screw oil meets the operating condition
- 【SERVICE】Our QC department does 100% quality inspection on the sight glass goods before delivery. We will do a 100% refund if the sight plug part is defective. Your valuable suggestions and advice will be greatly appreciated by our team

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09FPMLGDF |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #486,840 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #1,863 in Air-Compressor Accessories |
| Customer Reviews | 4.6 4.6 out of 5 stars (24) |
| Date First Available | August 17, 2019 |
| Item Package Quantity | 1 |
| Item Weight | 1.76 ounces |
| Item model number | 145-21 |
| Manufacturer | FANOVO |
| Material | Glass, Plastic, Stainless Steel |
| Package Dimensions | 2.48 x 2.09 x 1.65 inches |
| Part Number | 145-21 |
| Size | 1pcs 1/2 NPT Stainless steel |

## Product Details

- **Brand:** FANOVO
- **Manufacturer:** FANOVO
- **Material:** Glass, Plastic, Stainless Steel
- **UPC:** 730851399335

## Images

![1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank - Image 1](https://m.media-amazon.com/images/I/41-CXwgUhhL.jpg)
![1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank - Image 2](https://m.media-amazon.com/images/I/513gqzPx2HL.jpg)
![1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank - Image 3](https://m.media-amazon.com/images/I/51B8bofsB0L.jpg)
![1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank - Image 4](https://m.media-amazon.com/images/I/51KN2ej5RWL.jpg)
![1/2'' NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank - Image 5](https://m.media-amazon.com/images/I/51VS7CTKIpL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ High Quality 304 Stainless Steel Oil Sight Glass
*by J***M on February 20, 2023*

I recently bought the 3/4" NPT Male 304 Stainless Steel Oil Sight Glass Hex Head Sight Plug Liquid Level Gauge Oil Indicator Sight Window for Air Compressor Gearbox Fittings Hydraulic Tank and was really impressed with the quality of the product. It was relatively easy to install and the 304 Stainless Steel material is very durable and reliable. I would highly recommend this product to anyone looking for a reliable and long-lasting oil sight glass.

### ⭐⭐⭐⭐⭐ They look good
*by T***S on July 31, 2025*

Still in my toolbox, never used

### ⭐⭐⭐⭐⭐ a quality item
*by J***I on March 14, 2023*

nice product works as advertised

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---

*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-03-12*