So for years I have been doing the Prestone back flush of my cooling system. Using the Prestone kit where you put their "T" fitting on the heater hose. So yesterday I did a flush and coolant change. The plastic cap (which fits a garden hose, the fitting is plastic too) has a rubber full size gasket which has broken in the middle leaving the plastic cap itself to get heat and pressure. I know this is the weak point of the system so.. Does anyone know of a Metal "T" fitting which will fit not only the heater hose but also a garden hose fitting? and a metal cap that fits a garden hose? Of course the fast fix is the get a replacement rubber gasket to fit inside the cap. Before folks start ragging on the whole thing is a weak spot. I have had this on my car for years with no problems. I just want to make it right before a problem arises. Thanks.