Modular marine assistance please.

[Kershaw]

I have a MM24 with 3 1-1/2 bulk heads.

question 1: my sump has 2 1” return wholes. I intend to reduce 1-1/2 to 1”
On two of the drains. Where is the best place to reduce? At the bulk head? At the gate valve? Or at the sump?

question 2: should I make a u pipe or just run a screen on main drain?

please post pictures of you installed
Yours. Thanks.

 

[Water Dog]

1). I would reduce it after the bulkheads coming out of the external drain box. Make sure your gate valve is right before where the primary full siphon line enters the sump.

2). I use U pipes in my MM overflow by joining a pair of street elbows. It makes a much more compact u tube. I have u tubes on both my primary full siphon and my secondary trickle line. I think it does a great job of eliminating noise coming from the external drain box.

 

[Kershaw]

1). I would reduce it after the bulkheads coming out of the external drain box. Make sure your gate valve is right before where the primary full siphon line enters the sump.

2). I use U pipes in my MM overflow by joining a pair of street elbows. It makes a much more compact u tube. I have u tubes on both my primary full siphon and my secondary trickle line. I think it does a great job of eliminating noise coming from the external drain box.

Do you have a air hole in the secondary u pipe?

 

[Water Dog]

I do

 

[Kershaw]

Awesome thanks. Any chance you got a picture?

 

[Water Dog]

I’m not home right now. I’ll check when I get home

 

[DCR]

I am not sure what the U-tube does on the full siphon. I just use a strainer on mine. Definitely use a U-tube on the normal overflow.

 

[Kershaw]

I am not sure what the U-tube does on the full siphon. I just use a strainer on mine. Definitely use a U-tube on the normal overflow.

That’s one of things that confuses me. Only thing I could come up with is depending on flow maybe it is more likely to suck in air without the u tube…

 

[Water Dog]

I just don’t like those strainers unless they’re cleaned frequently as they will clog.

 

[Water Dog]

Hard to see but here you go…. Mine is the much smaller 12 “ 1200 gph box, because of sump space constraints, I’m only running a Herbie….

 

[Water Dog]

And here are the lines entering the sump. Note the gate valve is right before it enters the sump…

 

[Kershaw]

Hard to see but here you go…. Mine is the much smaller 12 “ 1200 gph box, because of sump space constraints, I’m only running a Herbie….

Could you tell me how you did the bulk head gaskets?
Mine came with 2 but I read that allot of people get sheet gasket for in between.

so I used ones that came with it inside over flow and inside tank and neoprene gasket in between tank and over flow. It’s not plumbed to I can still change it

 

[Water Dog]

The only gasket necessary are rubber gaskets between the tank exterior and the external drain box.