For undoing the hoses, the hose union spanner (above) must be clockwise relative to the cooler spanner, positioned such that the spanners can be squeezed together with one hand - although both may be needed for old fittings. When squeezing no rotational force must be applied to the cooler spanner, only the hose union spanner must move - anti-clockwise as you look down on it.

For tightening, the hose union spanner must be anti-clockwise relative to the cooler spanner, and when squeezing only the hose union spanner must move - clockwise as you look down on it.