From Grey Plastic Bayonet To Steel Bent Tube. Suits GS/M 80 and 81 In Industrial Applications. USED TO BE GOOD 15 YEARS AGO, UNTIL HOSE CHANGED TO HAVING FLATTER, BROADER SPIRALS. PLASTIC HOSE 22301500 IS FAR BETTER VALUE FOR MONEY AND CAN LAST MORE THAN 10 YEARS.