A dab of green or blue loctite when you put the nut on the threads will hold it in place. Just need to let dry for a day before putting in water. Don't use Red - you will have to heat it up to remove it.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).