Um, Hellblazer.
If you'll take a look in the Toolset, there is not, in fact, an "equippable box". Some base item types (for example, Gauntlet), are equippable. Some base item types (for example, Misc. Small) are not.
More to the point, items have models that go with them. Most of our cool models are drawn from (or variations on)
Lisa's Holdables, which are all quite cool. There are not, however, any pipes. So in order to make the pipe equippable and visible, a 3d model would have to be created, tested, added to the hakpaks, and the pipe items themselves would have to be remade as whatever base type they would now belong in.
So it's not a "would you mind?", it's a "could you do a great deal of work?".
For that reason, I suspect the answer will be no.
Edit: These, I suspect, were the inspiration for our pipe system. So they have an inventory icon, but no model.