... filter, rubber compensator air flue compensator, flexible hanger, rubber shock pad, shock absorber, pipe damper, seal, gate valve,check valve, foot ... loose joint ,used at shock absorber and compensate for displacement.JGD mean single ball (arch),JGD-A dual ball ,JGD-B ... climate , also called rubber joint,soft joint,shock absorber,tube vibration isolator,pipe shock absorber , all mean to JGD rubber ...