GHMP1215F 12mm x 15M Garden hose, fitted, plastic fittings GHMP1230F 12mm x 30M Garden hose, fitted, plastic fittings GHMP1818 18mm x 18M Garden hose, unfitted GHMP1830 18mm x 30M Garden hose, unfitted. Holman's Multi Purpose Garden Hose is a good quality hose that suits the requirements for most applications. The hose comes in either standard 12mm diameter or 18mm diameter. The 12mm multi pupose hose comes fitted with plastic fittings and is ready to attach straight to the tap.