Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

I think I have a winner with a combo, using both the O-Ring and Silcone Tubing.

• Prep sight glass and seals with a wee bit of lube, I used Super Lube via a pen dispenser.  This really helps the seals move and not bind - very very little is needed (which is why I used my pen dispenser).
• Put Screw Fitting onto sight glass.
• Next put seal onto sight glass so it will go up inside the screw fitting - uxcell Silicone O-Rings 6.5mm OD, 3.5mm ID, 1.5mm Width via Amazon
• Next, about 0.15, put silicon tube onto sight glass (it needs to span the elbow and onto the sight glass) - ZerksPlus High Temp Silicone Tubing 3/16" ID x 1/4" OD via ZerksPlus Website
• I finger tighten the screw fitting into tank elbow - I did not use my 3/8th wrench (spanner) at all.

I did this on the Empire / Laboratory Materials #43 Turbine.  The seals in this guy were actually okay and not sure why I picked it off the shelf to re-seal.  Though as you can see the seals came out of the screw fitting perfectly (the black ones) and still had a "rubber like" feeling to them.

I wished I had something to be able to cut the silicone tube exactly straight - much like I can't draw a straight line, I can't cut a straight line...

Important to note: Insure the screw fitting threads and set is as close as perfectly clean as you can get it. 

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