Note: This is a 6.1 wet end. If you need a 6.3 wet end see 34-402-1256 - Wet End, Gecko AquaFlo XP2/XPE, 1.5ohp/2.0thp, 2", 6.3" dia, 56fr.
56 frame spa wet ends can have one of two designations - 6.1 or 6.3. The difference is the measurement between the top two thru-bolts. 6.1 wet ends measure 4" and 6.3 wet ends measure 4-1/8". See diagram below.
