The Jayco Dual Lockable Water Filler is a combined tank fill and mains pressure inlet designed for use on Jayco caravans and RVs. This unit allows you to either fill your fresh water tank via hose or connect directly to a campground mains water supply, all from a single, lockable exterior fitting.

Featuring a plastic internal valve, this filler includes clearly defined rear connections for mains pressure, tank fill, and breather hose, making it a direct and practical replacement for existing Jayco dual fillers.

Important: This unit uses a USA female NPT 3/4" mains connection, not BSP.

Features:

• Dual-purpose water filler: tank fill + mains pressure inlet

• Lockable exterior flap for added security

• Plastic internal valve

• Designed for Jayco caravans

• Direct replacement style fitting

• Supplied with one key

Specifications:

• Brand: Jayco

• Product Type: Dual lockable water filler

• Model: 800-01081

• Mains Water Inlet: USA female NPT 3/4"

• Rear Mains Outlet: Male BSP 1/2"

• Tank Filler Outlet: 28 mm barb

  • Suits heated 25 mm black hose (ID-10715)

• Breather Connection: 1/2" barb

• Hole Size Required: 120 mm x 150 mm

• Outer Flange Size: 165 mm x 195 mm

FAQ

Q: What does “dual water filler” mean?
It allows you to fill the water tank by hose or connect to mains pressure water, depending on how you’re set up.

Q: What thread is the mains water inlet?
The inlet is USA female NPT 3/4 inch (not BSP).

Q: What hose size does the tank filler suit?
The tank filler uses a 28 mm barb, which suits 25 mm heated black hose.

Q: Does this include a key?
Yes. One key is supplied.

Q: What is the difference between USA NPT and BSP threads?
USA NPT (National Pipe Thread) and BSP (British Standard Pipe) threads are not interchangeable.

• NPT threads have a different thread angle and taper compared to BSP

• A BSP fitting will not seal correctly in an NPT inlet (and vice versa)

• This Jayco water filler uses a USA NPT 3/4" female thread on the mains water inlet

If your hose or fitting is BSP (common in Australia), you will need a BSP to NPT adaptor to connect safely without leaks.