The ornamental design for a head of waterpurifyingfilter for refrigerator, as shown and described.
1. Head of water purifying filter for refrigerator
1.1 is a top and front perspective view;
1.2 is a side elevation view;
1.3 is an opposite side elevation view;
1.4 is a front elevation view;
1.5 is a rear elevation view;
1.6 is a top plan view;
1.7 is a bottom plan view; and
1.8 is an alternate perspective view.
The broken line showing of a filter in Reproduction 1.8 is included for the purpose of illustrating environment of the article while all other broken lines are included for the purpose of illustrating portions of the head of water purifying filter; the broken lines form no part of the claimed design.