... stainless steel shell titanium heat exchanger 1,inside is titanium tube outside 316L 2,surface oxide-resistant non-pollute ... exchanger for swimming pool1,Inside heat exchanger is made up of stainless tube ,outside is staineless.anti-corrosion ,2, in the ... system. refrigeration is R22 ,R134,R407,R41OA . stainless steel shell titanium heat exchanger Tube typeseamless titanium tube or whorl tubeinside ...