I'm a do it yourselfer, so be kind lol. I have 1/2in pipe all through my house including my main water supply line. We already have poor water pressure which is the reason for this question. I'm going to replace the hot water heater but it seems like I can't find a corrugated steel 1/2in supply flex hose, unless it's from random online sites, which I don't trust. I decided on corrugated steel because it seems to last longer from everything I've read. I ordered shark bite 1/2in push connect to 3/4in water heater hose, but was under the impression that the hose itself was 1/2 in, not just the connector. It turns out the hose is actually 3/4in. I'm sick of shopping around and I wanted these hoses for durability and convenience. Will my water pressure be heavily effected by using 18in 3/4in supply lines in a house with 1/2in water lines? I would be using 2, one on cold side, one on hot side, totaling 36in. I know I could straight pipe it with 1/2in like it is now, but I was looking to do an easier diy job. Thanks in advance for any advice on the situation.