i am planning to make underground pipe connection to my sprinkler irrigation system.i mean , its estimated about 500 feet length og 4" pipe and 300 feet of 3" pipe is required and it has got a head of 100 feet . so could you please help me with this by roughly giving knowledge about pipe thickness and cost of the same . expecting your reply ASAP.PlEASE MAIL TO MY PREFERRED MAIL ID . and FYI i prefer 6 kg and 10 kg pressure pipes.