It may be light, but even if the inner diameter of 53 mm is stated as the installation of the hose, it is tougher than that. Although it is a lever lock made by Nitto Kohki Co., a slight lever is hard. Lubrication is necessary. It is price-oriented.
Since the diameter of this kind of coupler is Φ 27 with respect to the inner diameter Φ 25 of the hose, it hardly enters when it is a hard hose. If you warm the hose with hot water and apply the lubricant, it will not enter, eventually putting it up to half. Is there any good way to do it?