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Frequently Asked Questions
What holds a tank connector sealed?
A gasket under even compression.
Between a flange and a backing nut.
Against the tank wall.
It is a hole below the water line.
Held closed by that compression alone.
Why does mine weep?
Usually because it was overtightened.
Which distorts the gasket.
Rather than compressing it evenly.
And tightening further makes it worse.
Slacken, reseat and tighten evenly.
Does the surface around the hole matter?
Considerably - it must be flat and clean.
Tank walls are curved or ribbed.
And a gasket cannot seal a rib.
Some tanks have flat bosses for this.
Use them rather than a convenient spot.
At what height should the outlet sit?
Slightly above the tank floor.
An outlet at the very bottom.
Draws the settled sediment.
Raised a little, it leaves the layer.
And takes cleaner water above it.
How should the overflow be sized?
Larger than the inlet, always.
Its job is to handle inlet failure.
A float valve stuck fully open.
Same-size overflow cannot cope.
And the surplus finds another way out.
Where should it discharge?
Somewhere it will be seen.
A warning pipe is a warning.
Run into a drain it hides the fault.
Which then continues for months.
Visible discharge is the whole point.
Does it need a screen?
On a potable tank, yes.
An open pipe is a way in.
For insects especially.
Screen the overflow and the vent.
And check the screens are intact.