This Jayco water filler will allow you access to the mains water. 

As well as 1 or 2 water tanks.

Features: 

• A  lockable door ( keys included) 
• An insert flap to allow the hose to connection while the door is locked.
• Rubber dust caps to keep bugs and dirt out.

Measurements: 

• This Requires a Cut out size of  185mm x 110mm with 8mm radius corners.
• Overall dimensions 227mm x 150mm with 25mm radius corners.