Used PK Lens Cap 

 Cap is generic brand, it is not made by Pentax, but it is made for Pentax  lenses. It fit lens well, and locks properly. It is not loose. 

Lens Cap has been used, but it is in very good condition. Lens cap been used with some signs of cosmetic use. It has couple minor scratches from use.  Cap is fully operational and function as intended.  I would rate it at 7, on a scale from 1 to 10.

Price for one cap. 

Shipping is free within USA and $3  worldwide.