Ordered 4 of these & 3 of them are far too small to make a good fit. Using a pair of calipers they OD on the three measures 0.94". The last unit measured 0.99"
These are not the correct size for a 1" hose. The barb itself is 1" at the widest part which means a 1" ID hose slips right on with no effort, so it won't seal properly even if you clamp it to death. The hose should need a slight stretch onto the barb... which means this thing should be like 1/16" larger probably.