Water hose. Runs from the lower radiator to water pump, suits petrol and some diesel engines 1.5-1.8.

Engine code fitment:
Mk1 Caddy - JB, EM, EW, HN & JH, JK & ME Diesel
Mk1 Golf DX, EE, EF, EG, EH, EJ, EM, EN, EW, FN, FP, FR, FT, FV, GH, HN & JB & JJ Petrol, CR, CK, CY & JK Diesel
Mk1 Cabriolet - EM, FN, FV, FR, JB, GH, EH, EG, EN, DX, KT, EW, EX, HN, RE, EWA, JH, 2H, JJ & EJ petrol, CR, JK, CY & CK Diesel
Scirocco - EG, EE, EF, EG, EH, EM, FN, FV, FR, JB, GH, EJ, EN, JJ, EW, KT, JH, EX, HN, RE, EWA & DX petrol, CR Diesel