GROCO 3/4" Bronze In-Line Check Valve [CV-75] Paddlesports | Navigation Lights the built-in flasher will show

the built-in flasher will show you the bottom

You can see fish swimming in front of or below your boat

This allows you to observe tank levels anywhere on the vessel where there is an NMEA 2000 compatible display such as the Maretron DSM250

2″ Delco-Style Mounting

GROCO 3/4" Bronze In-Line Check Valve [CV-75] Paddlesports | Navigation Lights the built-in flasher will show3 4" Bronze In Line Check Valve Features: C83600 cast bronze construction NPT threaded ports 1 2" 2" sizes Suitable for use with diesel fuel or gasoline Specifications: Construction: Bronze Box Dimensions: 3"H x 3"W x 4"L WT: 0. 55 lbs UPC: 742985145948