The title should read Pre load spacer Racetech suspension. I need to make my preload spacers longer as I had the front lowered an 1" but now want to change back to normal height. The PVC that was supplied with the springs is 3/4" schedule 40. The only PVC I can find locally is 20mm class 12 pressure PVC. This pipe is not as thick as the schedule 40. Has anyone else used the class 12 or know where I could get a thicker pipe, maybe class 18?h