S.U.R.&R.® is a leading manufacturer of high-quality fluid line repair kits and specialty tools, designed to make any repair process quick, easy, and cost-effective.
Cooling System Hose Standards
SAE
SAE 20R1: Heavy duty service; standard wall or heavy wall
SAE 20R2: Heavy duty service with embedded wire for kink and vacuum resistance
SAE 20R3: Normal service heater hose (ID under 1 inch)
SAE 20R4: Normal service radiator hose (larger IDs)
SAE 20R5: Normal service with embedded wire for high flexibility and vacuum resistance
CLASS
Class A: High temperature resistant (e.g. silicone)
Class B: High oil resistant (e.g. nitrile)
Class C: Medium oil resistant (e.g. neoprene)
Class D-1: Low oil resistant; improved service (e.g. EPDM)
Class D-2: Low oil resistant; standard service
Class D-3: Low oil resistant; high temperature resistant (e.g. p-EPDM)
*
EC suffix: Electrochemically resistant rubber;
HT suffix: High temperature resistant rubber (>125°C)
Attention California Customers - Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov.
Cooling System Hose Standards