mechanical seal M3 and it has four choices of seats: BT, G4, G6 and G9 seats. It is used in texitle industry, chemical pump, food pump and hot oil pump etc. M3 seal is equivalent to Burgmann BT-RN, Roten type 2, Vulcan type 12, Flowserve 42, Uniten 2, AESSEAL T03.
M32-----rotary is carbon insert;
M32 with G6 seat--------M32N4;
M32 with G9 seat--------M32N
M37G------rotary is SIC insert;
M37G with G6 seat------M37GN4;
M37G with G9 seat------M37GN.
It has new design and old design. New design is a slot and old design is a round hole.
pls. check the new design picture and old design picture: