said by shdesigns:Are you sure it is 1" NPT? Most filters are 3/4" NPT (thread size is about 1").
Yea if the hole looks like it is 1" then thats 3/4 NPT, the filters I installed here where all 3/4 NPT, but I don't know what the OP has, if it is truly 3/4 NPT one thing he does have is less work to do.