The Sim/Tech septic tank guide corners or Sure-Sets help to assure watertight sealing of mid-seam and sectional tanks as well as tops.  They do so by guiding the tank section or top into place.  This accurately lines up the seam and helps to eliminate the sections from prematurely touching and affecting the placement of sealant such as butyl ribbon.  The Sure-Sets are easy to use.  For example, after placing the bottom of a mid-seam tank put a small amount of butyl on a Sure-Set and push one into place on at least 2 corners of the tank seam (4 corners works best).  The butyl holds them in place while you wrap a 2” or 3” strap around the tank and Sure-Sets to hold them securely.  While lowering the top half of the tank, the wider top end of the Sure-Sets combined with the elasticity of the straps receives and steadies the top.  The top is then funneled into place by the Sure-Sets.  Once the top half of the tank is in place the Sure-Sets are ready to be removed and used on the next job.