New style filter assembly with 3/8" threads. Includes new style air filter, head, and o-ring.
Note: Do NOT order if your head has 2 holes on the SAME side of the head. This head has 3/8" FPT threaded ports on both sides. If your head has a 3/8" port 90° from the air filter, you will need to take a 9/16" drill bit to predrill a 3/8" pipe tap (if your head has 3/8" outlet) to tap the hole for your unit. Simply take a 3/8" plug and plug up the unused hole.