Found on many vintage travel trailers in the 1970s and later, this telescoping water fill simply opens to allow a campground fill hose to pour water into your holding tank. 

Specifications 

• Overall mounted dimensions: 3.5" x 3.5" square
• Mounting holes: 2.5" square
• Fill Barb: 1-1/4" hose (fits our VTS-947A or VTS-947B)
• Vent Barb: 3/8" tubing (fits our VTS-533)
• Color: colonial white or true white