The Burgmann M74N is a seal, which can be categorized as a wave spring seal. It is an alternative to the  AES W07DMU, Burgmann M7/28-G49 and 53 others. It is suited for the Apex TD 32-200.B/S, Flowserve 100-65CPX160, Flowserve 100-65CPX200 and 338 others.

Mechanical seal H7N is wave spring design and can replace BURGMANN H7N.
Garbarino pump model 200-G-61, serial NO. 726088, mechanical seal 4202, Part NO. 4202BB80MH7N2QAEGG is available in stock. 

Mechanical seal H75 is multiple spring design and can replace BURGMANN H75 and MTU DR1-HS.

Mechanical seal M7N is wave spring design and can replace BURGMANN M7N.
Mechanical seal M74 is multiple spring design and can replace BURGMANN M74. 
Mechanical seal M74F has pumping ring and is used for higher pressure. 

All these seals can be double seals, tandem design or back to back design. 
Mechanical seal M74D is a double seal. 

M7N and M7G49 can be used for KSB Etanorm pumps and double mechanical seals, back to back arrangement. 

MECHANICAL SEAL inboard 030-R(433.01)       MECHANICAL  SEAL outboard 030-R(433.02)
KU028S.M7G49                                                           KU028S/M7N
KU038S/M7G49                                                           KU038S/M7N
KU048S/M7G49                                                           KU048S/M7N 

MG13/RMG13, HJ92N/HJ977, and M7N can be used for Grundfos pump model B, NB, 50/60HZ