Plumbing A External Filter Into A Tank...

[LiamC]

I've got an acrylic aquarium with two 25mm diameter holes for the filter inlet/outlet pipes. What kind of pipes would I use to connect the filter to the tank, and what kind of screw fittings would I connect the pipes to the tank as a watertight seal. Thanks

 

[Shaddex]

The tank connectors are called Bulkheads.  http/www.ebay.co.uk/itm/Aquatic-Fishsafe-Bulkhead-fitting-/111074328317?pt=UK_Pet_Supplies_Fish&var=&hash=item19dc8bbefd
 
Attaching to your filter would depend on what filter you have.