Marinco Plug & Boot Value Pack - 30A-125V [305CRPN.VPK] Brand_ACR Electronics you may use the tricuspid

you may use the tricuspid check valve (included) on the straight fitting to minimize the back flow of water

Raymarine In-Line Terminator

PN:  7146

Included with Batery Main Distribution Panels

Marinco Plug & Boot Value Pack - 30A-125V [305CRPN.VPK] Brand_ACR Electronics you may use the tricuspid30A 125V Male Plug & Cover The 305CRPN. VPK 30A 125V locking blade male shore power plug features corrosion resistant contacts and terminals. A weather resistant cover is included for added protection in harsh environments. The plug body is made of yellow nylon with a ribbed design for secure grip. WARNING: This product can expose you to chemicals including di(2 ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer,