Tender For supply of ptfe bellow with ss flange, size: 25nb metal to glass(fixing for fitting of msgl to borosilicate 3.3 , ptfe bellow with ss flange, size: 50nb metal to glass(fixing for fitting of msgl to borosilicate 3.3 , ptfe bellow with ss flange, size: 80nb metal to glass(fixing for fitting of msgl to borosilicate 3.3