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Be Careful When Indirect (Back Door) Crossing

April 2011

Product HighlightWhat is an indirect or "back door" cross? An indirect cross is common practice where, for example, a Hastings filter is crossed to an original equipment filter indirectly as the result of a cross to a competitor's filter.

In this example, the Hastings filter is not listed as a cross to the original equipment filter (OE), however, a competitor's filter is listed as a cross to both the OE and Hastings filters.

If the competitor's filter crosses to both the OE and Hastings, should we assume that the Hastings filter is then a proper cross to the OE? Not necessarily. In this case, the Hastings filter is a proper cross to the competitor's filter, however, there is no guarantee that the competitor's filter is a proper cross to this OE filter. Simply put, we have no control over how our competitors arrive at what they consider a proper cross back to the OE. Their product may fit the application, but may not protect the application. This is commonly referred to in the industry as a "will-fit", as the filter will fit the application but may not protect it.

The recommended practice is to confirm the direct cross of a Hastings product to the OE in our catalog cross-reference, or, to determine the correct Hastings product to use via our catalog application listing.