This is optional for low and medium profile but standard on high profile fresh water tanks

Porthole/Connection Plate consists of:

1). Removeable 11/2" BSP filler cap fitted with tank vent screw

2). 3/8" BSP(F) connection suitable for use with hose connector or push fit pipe fittings. Includes 45cm suction hose below

3). 3/8" BSP(F) connection for breather

4). 3/8" BSP(F) spare connection

5). Space to fit flange-mount type tank senders