I have built a hop strainer that I also am planning to use as a mash tun manifold.
I have an elbow that is soldered onto a pipe that goes through the side of the tun and the same set up on the boiler. The street end goes is then welded into an elbow with compression at one end a street at the other. The street is welded into the elbow creating an "S" so the tap can be higher up the boiler or mashtun but the screen still be at the bottom. Connected to the compression is a fitting I have made out of three Tee's that have one of its ends being a street end so that 22mm mesh tubes (http://tinyurl.com/c4azmh
) that are then connected with jubilees can go off in four directions - two going around the circumference (one each way) and two that run parallel to each other across the tun or boiler which meet up at the other side in a similarish configuration (but without the middle tee since there is no valve at that end). The mesh is stuffed with 15mm copper pieces about 20-30mm long but not too much so as to make it inflexible. The idea is that the manifold has some "give to it" so that if the tun and the boiler are clos-ish in size to each other they can be used for both purposes.
Similar set up to this one done by brewzone (http://tinyurl.com/cal6ld
) but with two extra mesh tubes running across the tun or boiler parallel to the valve so it has a more "traditional" manifold shape. Sorry don't have a camera at the moment so you will have to do with you imagination and this photo of brewzone's much superior handiwork to mine.