Abstract: An annular disk-shaped pipe adaptor permits a small water meter to be connected to a large diameter water pipe. The adaptor has a first side which is adapted to attach to the large flange of the large diameter pipe. The opposing side of the adaptor includes a plurality of outwardly extending threaded studs which are adapted for extending through holes provided in the flange of the inlet pipe of the water meter. A tapered central aperture gradually reduces the flow of water as it passes from the large diameter pipe to the water meter.