Air and Liquid Filters
ROYAL RL-7003 Series Filters

"Western Filter Co., Inc. provides this one triple length lube oil filter to replace three of 4P2839 lube oil filters for a Cat 3500 gas engine. This design provides a quick and easy change of filter elements on this engine. No sliding or fishing for the 2nd and 3rd filter element. Manufacturing the one length also makes this filter element cost much less requiring 4 less seal plates and gaskets. There is also a labor savings, since it takes the same labor to make one triple length filter as it does one shorter filter element."