Oil sight glass tube for Model 20 Hupp

[lump]

My friends are restoring a Model 20 Hupp, and need a replacement sight glass tube (one was dropped and broken). They acquired some glass tubing, and had it cut to length, but  the tubing walls were too thick. Any suggestions for a good source? 

 

Thanks in advance! 

 

[trimacar]

Go to McMaster Carr website and catalog, you can buy just about any glass tubing you need....that's what's in my Model 20....

[lump]

Thanks, Trimacar!