Because of our attempt to simplify and standardize our 495/4195 series pump offerings, the pumps with buna mechanical seals as standard have been replaced with pumps including the new viton with carbon vs silicon carbide faces seal. This is now construction detail is now standard.
The BOM for the replacement pump is 4-1920-2231-559 = $3015.00 LIST. Delivery for this pump is 4 weeks.