What size hole for 50mm overflow?

Discussion in 'Anything DIY Related' started by Louis Scheepers, 15 Oct 2010.

  1. Louis Scheepers

    Louis Scheepers

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    I'm planning on building two external overflow boxes on my new tank. I want to use 50mm pipe for the overflow. Should the hole then be 50mm or are the connectors bigger, say 52mm? I want the correct size drilled when I order the glass.

    I have the same question with the return. What is the normal size of a return line for a 4000-5000 lph return pump, 25mm or 32mm? What should the hole size be for that?
     
    Last edited: 15 Oct 2010
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  3. ZaxXx

    ZaxXx

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    Make it a 25mm hole for a 20mm pipes and fitting and 55mm if you want 50mm fittings. . . but even a 45mm is fine for 40mm fittings...
    i noticed 20mm and 40mm pipings are the common sizes for returns and overflows
     
  4. RiaanP

    RiaanP Moderator

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    Buy the fittings first before you drill the holes, or get the holes drilled.

    Easiest for me was to buy the fitting from Idol Marine, while they were drilling the tank.

    Simple and you know it will fit...
     
  5. Louis Scheepers

    Louis Scheepers Thread Starter

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    Thanks for the replies!
    I had a look today and found a fitting that would seal properly (think it is called a bulkhead fitting)... problem is that is is only threaded on one side, so pipe can go down to sump, but nothing on the other side to connect the durso standpipe.
    Searched on the internet today but couldn't find anything helpfull, except one thread on MASA where someone was using a male and a female adapter: one on each side of the glass and then they screw into each other. Is this the way to go? Where do I find a seal or o-ring washer for it?
    Is there another type of connector that I just missed?
     
  6. RiaanP

    RiaanP Moderator

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    Go to Builders Warehouse or Chamberlain. Check the SWIMMING POOL section. Do not ask anybody for a bulkhead connection. Or mention PVC connections. They will sent you to the wrong places.

    But check between the swimming pool stuf. There is a bulkhead connector that will work. White one side, famale slip and treaded male. With grey other part, female tread and female slip. With O ring. I use it on my plastic cryptic tank. And it can take the standpipe then on the inside.

    Or, ask Idol Marine. They have a lot of connections
     
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