Aluminum Cam & Groove Coupler, Female Half, 1-1/4 Inch ID Hose Barb

For the 1-1/4 inch size, you're looking at a 150 PSI pressure rating. That covers all sizes from 1/2 inch up through 4 inch in this product line. Just keep in mind this coupler is rated for liquid service only. Compressed air and steam are a hard no with cam and groove couplings like these, so make sure your application stays within those boundaries before putting it to work.

The hose end is a 1-1/4 inch ID hose barb, so it matches a 1-1/4 inch inside diameter hose.