as is well known in the art it will be appreciated from the above description that the cap 34 is free from all encumbrances from the hose 38 or cable 46 and thus may be raised once fasteners 64 are disconnected the cap 34 is a cylindrical disk 66 fitting snugly against the upper edge of the walls 42 held in place by a wrapper 68 fitting over the disk 66 and extending a brief distance down the sidewalls 42 to be engaged by the fastener 64 which may be a stainless steel hose clamp or the like in the event that a pump must be removed or a measurement or inspection of the well is required the cap 34 may be easily removed and replaced and once removed access to the well pipe 12 is readily had referring now to fig4 in a second embodiment the cap 34 is a single disk 70 having a notch removed around its circumference so as to fit a short distance inside the walls 42 and then to rest on top of those walls 42 providing a hermetic plug when held by fasteners 64 a cylindrical port 72 may be cut in cap 34 along an axis generally parallel to the axis of the well pipe 12 but offset therefrom by offset 91 the inner diameter of this port 72 allows a second cylindrical volume 76 that as a result of the location of hook 48 and hanger tube 50 described above with respect to fig3 is unobstructed as it extends into the well pipe 12 this cylindrical volume 76 has a lesser.