okay, i have been trying to construct a high pressure "shock pump" after seeing a couple on this site. **I have already searched through multiple pages** Does anyone have any insight into the inner-workings of pumps like these http://www.spudfiles.com/forums/files/thumbs/t_new_img_0495_468.jpg from ...

would a piece of pvc be enough to make it air tight, and if it could, how?

does anyone have any suggestions what could i use in place of the neopreme cymbal muffler for the diaphram

sorry for asking the same question twice

can someone explain how i make the valve

please explain valve mechanism