Raccorderie Metalliche and thermal solar plantshttps://www.racmet.com/en-ww/thermal-solar-plants.aspxAll steelPRES fittings are pre-fitted EPDM O-Ring, soon replaced by a green FKM O-Ring developed to be used at high temperatures -20/+220° C and compatible with Glycol inside the plant. ... All inoxPRES fittings are pre-fitted EPDM O-Ring, soon replaced by a [...]