Gardena Hose Coupling 12mm SKU: 119930 MODEL: G931B Error. try again later You've successfully joined the club $ 5 .36 each Available on orders $50 to $1500.More info × Mitre 10 Variants With the use of the Hose Coupling, a hose can be easily extended. It can also be used to change from 19mm to 13mm hoses. Supplied loose. Features and benefits Easy extension of a hose. Connects hoses with different sizes. Suits 13mm hose connector.