cylindrical interior space for shell 21 that is constructed and arranged to receive the fluid filter cartridge 22 upper edge 38 that helps to define open end 29 is considered to be an exposed or free edge and open end 29 constitutes the entrance opening of the shell noting that the opposite end of the shell includes closed base 30 as noted the fluid filter cartridge 22 is installed into the shell by inserting the fluid filter cartridge into the interior space by way of this entrance opening shell 21 is preferably a molded plastic shell that is used without a nutplate though additional embodiments contemplate use of a nutplate the enlarged series of outer threads 39 in terms of the outside diameter size of shell 21 requires a compatible head design so as to change from the head structure that would be used for head connection to a nutplate shell 21 is constructed and arranged so as to reject or prevent the insertion of a spin on style of fluid filter both single use and multi use embodiments are contemplated wall thickness can be somewhat less for a single use filter assembly as compared to the desire for a slightly thicker wall when the shell is designed for multiple uses i e reuse with replaceable fluid filter cartridges as presented for the disclosed invention if the same basic shell shape is going to be used for both types of fluid filter assemblies disposable as well as multiple use various design changes will be made for some of the shell.