I used 1 large vac and the top of another vac. no sealent cause the caps fit perfect. one end is hooked to a rio 600 and other end is attached to an elbow in my tank, prob can be hooked to a spray bar if you want. there is a nipple on the rio 600 tht i attached my co2 hose to.
I use this one on my 25g and a pvc version on a 29 gallon. Id suggest the pvc unless u already have the vac to use, i wouldnt buy a new vac to make this.