Appearance size There will be some water coming out of the valve side port during operation, even when the emergency valve is not engaged. It is the inspection to ensure the quality before leaving the factory. Does not affect performance Internal gear size Our values are tested before leaving the factory. If after a period of use, water cannot not be sprayed, you can remove the gear to check if something is stuck. After removing the debris, you can use it normally Hull display Our value is also suitable in a saltwater pool. Easy to install, saltwater pool is also suitable. The white material will appear a little yellow when used for a long time, please know Parts Drawing Our G52 backup valve has G53 gear mechanism inside, not just housing Better quality Better service Some questions about the G52 backup value Our G52 backup valve replacement kit for Polaris 180, 280, 380 pool cleaner Yes! Our valve includes a G53 gear mechanism to inside, not just a case In order to better ensure the