Ok so for a few jobs now over 10 years I have fed 3/4" pex thru a 1" pic busted line. Using the old line as a sleeve and no digging. Pushing works great for up to 100'. But last week I did a 1/2" line thru 1" 500' with pull string. I know your not suppose to feed a house with 1/"2. But guess what? Meter only 5/8" gate valve is smaller. I eliminated gate valve. Most of your lines in house are 1/2". Only 1 bath with older retired couldn't afford digging a new water line. So leave your comments about pipe size alone. My real question. I need a plumb bob shaped tool with hole thru center for 3/8" airline cable to feed thru and secure. Needs 2cutting blades that just reach thru outter walls of pvc. Behind blades is a slightly bigger than blades. Then on back side of "bob" a 3/4" male thread to tye on pex. I get a lot of 3/4" pic water lines. If I had this tool( if it exists). I could dig at meter feed cable thru line with nothing but bell fittings. Then attach tool. Pull on cable with winch. The tool should take all the pressure and split and spread the pipe while pulling the new line behind tool. This bursts the old line while pulling new line without digging. Each job would determine where winch is. I know it works.without this tool. Old backhoe operator taught me this technique without a tool. He would just expect it to pull old line out while dragging new copper thru. . If your comments include anything besides ideas for tool or where I can find one just keep to yourself. (Negative) I know it will work so don't try to correct me. 1/2" isn't great for new lines but the customer swears she has better flow. Mainly because we corrected the leak. But they are happy and I only worked for parts on this job. Took me 3 hours to do 500' new line. No digging.