I felt using a brand name like Milton which has been around since I was a kid would insure a quality product.  I use this female coupler with a Milton brand male coupler to keep the parts within the brand.  Unfortunately,  I have to push like crazy to insert the male coupler and then push upward to lock the female coupler so they stay together.  Such a simple thing and it doesn't work, tried other male couplers with the same result.  Much be made (you know where) poorly and the quality just isn't there. Don't waste you money on this.