we are specialized in designing and manufacturing all kinds of mechanical seals and filters.We have working mechanical seals for more than 20 years, and our engineer used working in AES seals,we are very professional in this products, you will see some facility in our website: www.btseal.com We can do most of seal,which can replace the similar products of John Crane, Burgmann ,AES seal, Roten,Sterling,Flowseve and Vulcan.If you can give us pump inside dimension, we can design seal for you. We anticipate the pleasure of hearing from you soon.