Tightening the compression fitting packing nut packs the teflon valve stem packing material around the rod for a watertight seal. Be sure the rod is polished smooth and clean. Rough spots will cause a leak.
Don't go too tight or the rod will bind and the 'heat' control lever won't be able to move it.
If it weeps later on, tighten the packing nut a little more.
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