Review on Stainless Radiator Flexible Coolant Universal Replacement Parts by Ricky Mayo

The tube itself is quite thick and makes bending difficult, so if you need a tight radius. Forget it. To make an about turn, it has an inside radius of about 4 inches or an outside radius of 5.5 inches. The pipe diameter does not meet the automotive standard for measuring coolant lines. The outer diameter is 39mm (approx. 1 17/32) and the inner diameter is 31mm (approx. 1 7/32). The rubber tip that goes over the tube has an inner diameter of 42mm (about 1 21/32). Using a gasket for a 1.25" fitting the inside diameter is 36mm (approx. walls 2mm. In most cases the wall thickness will be greater than 2mm. probably closer to 3mm actually (approx. 1/8 inch ) This is good because it will be a tight connection. It doesn't look like a sloppy connection of a piece of rubber to a pipe. If you have to close a 3mm difference with a clamp it will fail. The rubber isn't tight enough on the pipe. Another thing is when you clamp something there is usually a notch at the end of the nipple. This prevents the hose from slipping under pressure. This is not the case with these pipes. Now if you have the patience, you can use a small pair of pliers to flare the end to prevent the hose from popping out.O-rings that fill In order to seal the gaps tightly, the o-ring must be thick enough so that it can be used when installing on the pipe 2 mm larger in diameter sser than the pipe itself. This only closed the gap between the pipe and the rubber sleeve. It is best to use a stainless steel tube. It will never rot or soften, it has an extremely high burst pressure (1500+ psi). The problem to overcome is connectivity. If you have deep pockets and really want to beef up your engine with stainless steel hoses, you might want to check out Gastite. They have fittings and CSST (stainless steel corrugated tubing) up to 2" ID. I removed the clamps and rubber tips and purchased 4-ply silicone adapters that fit 1 3/8" ID and 1 1/2" diameter tubing .Inside diameter 4". I also got t-bolt clamps the right size for those pipe diameters. I just ordered o-rings that fit the last 4 ribs on each of my joints. I can still use aluminum ends. after I've used them changed so that the clips slide in.