Rear mount pressure gauges are often attached to a CIP (?clean in place?) system pipe via a spool, to gauge water pressure being fed to the spray ball. A ball valve is commonly used to regulate the flow of water into the CIP pipe. A bottom mount pressure gauge is likely found on top of a tank to monitor interior pressure. Whichever mount suits your needs, the ability to quickly and easily read the pressure gauge is most important. We recommend either a teflon tape or more permanent liquid to seal the gauge.