HA4 Long Option Filter – 1 of 2 filter height options For JK81/5 (HK81) filter housing – NOT VPK81/5 (HK81A) housing. HR2 Long Option Filter – 1 of 2 filter height options For JK81/5 (HK81) filter housing – NOT VPK81/5 (HK81A) housing.
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