"Bought 4 of these fittings for a farm cattle shed approximately 3 years ago. Just had to replace 2 of them, as they are full of water for about the 3rd time! The rubber seals had disintegrated allowing water to seep in. I specifically chose these fittings as they were a quality brand but they are of poor quality. The clips seem flimsy and do not grip the diffuser. Do not buy these fittings if to be used where water is likely!"