Boiler Sight Glass Install Tutorial Part 2 Cutting Glass & Reassembly - Weekly Boiler Tip

Sight Glass Cutting & Reinstallation – The Right Way
Part 2 of 2 – Glass Cutting + Safe Startup

Are you replacing a boiler sight glass? In Part 2 of our series, we show you how to cut the new glass, install gaskets and hardware, tighten correctly, and bring the boiler safely back under pressure without leaks.

📌 If you missed Part 1 (Sight Glass Removal), watch it first:
— “How to Remove a Boiler Sight Glass | Part 1”
https://youtu.be/fhc40pQ27O0


✅ CHAPTER MARKERS

00:00 Intro – Two Sight Glass Cutter Types
00:25 Score-Type Cutter Technique
00:52 Chain-Type Cutter Technique
01:22 Order of Hardware + Gasket Prep
01:48 Aligning + Setting the Glass in Place
02:10 Correct Tightening Method
02:36 Safety Valve Crack + Pre-Heat Procedure
02:52 Checking for Leaks + Final Adjustments

✅ Common Questions We Answer

🔹 How do you cut boiler sight glass without cracking it?
🔹 Score cutter vs chain cutter
🔹 How tight should the retainer rings be?
🔹 Why pre-heat the top valve first on a hot boiler?
🔹 What causes leaks after replacement?

🧰 Pro Tips from Technicians

• Always leave ~⅛” clearance at the bottom so glass doesn’t contact the valve seat
• Rubber gaskets need snugging over time — don’t over-torque
• Pressure test slowly & safely

✅ Need parts fast?

Find sight glass tubes, gaskets, cutters, valves & more at:
BoilerWAREhouse.com – Same-day shipping for critical boiler parts


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