Which side does the O ring go on on a bulk head?

[jason the filter freak]

I'm putting a bulkhead though an overflow so there is going to be water on both sides of the bulk head but I only want to prevent water from leaking one way. So in a normal situation does the O ring go on the water side of an application or on the outside? The inside right?

[tygger]

Goes inside... eg. inside the overflow side

[YBeNormal]

It goes on the flange side of the bulkhead fitting, not on the nut side, regardless if the flange is inside or outside of the tank.

[jason the filter freak]

It goes on the flange side of the bulkhead fitting, not on the nut side, regardless if the flange is inside or outside of the tank.

 

thanks thats what I thought I feel really dumb.

[YBeNormal]

No reason to feel dumb. You were smart enough to ask! You'd have felt dumb if you put it on the other way and it leaked. As you've already discovered, parental units don't like leaks.

[tygger]

Does anyone install the nut side inside the tank?

[flowerseller]

Does anyone install the nut side inside the tank?

I have no problem with doing that.

It can make it difficult to remove down the road but with a sawzall or dremel, splitting the nut later is not an issue.

[jason the filter freak]

I have no problem with doing that.

It can make it difficult to remove down the road but with a sawzall or dremel, splitting the nut later is not an issue.

 

Thank you mr.chip you just answered my next question.