"P" in the model number designates the pump option
As I learned from a member, Geoff Delp I believe, the model numbers can be broken down as follows ...
E , J , N - Model
2 - Built after WWII
L - Electric version
P - pump option
S - safety wringer mechanism
Eg. E2L, J2L, N2L /// E2LP, J2LP, N2LP /// E2LPS, J2LPS, N2LPS