Jobe Topaz 3/4" Long Tail Float Valve – Through-Wall Water Trough Valve for Stock Tanks
The Jobe Topaz 3/4" Long Tail is a water trough float valve built to keep livestock troughs, stock tanks and water tanks full automatically. Its long tail comes with a backnut and seal washer, ready to mount through the wall of your trough or tank.
Like every Topaz, it uses a pilot-operated diaphragm: the float works a small pilot valve, which opens the main valve for high flow and then closes gradually to help reduce water hammer. Set the water level by hand with no tools, and lock it off whenever you need to.
Jobe calls the Topaz a good choice wherever high flow and compact, robust construction are needed. Built from corrosion-resistant materials, with a built-in port for Jobe's FrostPro anti-freeze device (sold separately) for cold weather.
Features
Long Tail with Backnut & Seal Washer
1-1/2" thread length, supplied ready for through-wall mounting.
High-Flow Pilot-Operated Design
The float operates a small pilot valve, which operates the main diaphragm valve for fast refills.
Gradual Shut-Off
Closes slowly to help reduce water hammer in your lines.
Flexible Mounting
Installs top, side or bottom entry, horizontally or vertically — above or below the water line.
Tool-Free Adjustment & Lock Switch
Set the water level by hand, and lock the valve in the off position when you need to.
Specifications
Connection: 3/4" long tail (1-1/2" thread length, backnut & seal washer included)
Operating Pressure: 5–100 psi (0.3–7 bar)
Max Temperature: 140°F (60°C)
Water Level Differential: 3/4"–2-1/2" (20–60mm), increases with inlet pressure
Mounting: Top, side or bottom entry
Float: 125mm HDPE (standard)
Materials: Glass-filled nylon body, 304 stainless steel hardware
Frequently Asked Questions
Long tail or short tail — which do I need?
The 3/4" long tail has a 1-1/2" thread with a backnut and seal washer for mounting through a trough or tank wall. The 3/4" short tail has a 7/8" thread for a compact, low-profile connection.
Will it work on a gravity-fed system?
The Topaz operates from 5 psi (0.3 bar) up to 100 psi (7 bar), covering many gravity-fed and pressurized systems.
How do I prevent back-siphoning?
Jobe recommends mounting the valve at least two inlet diameters above the trough's overflow. Some mounting positions may not comply with local regulations, so check yours.
Need a different size or tail?
See every option on the Jobe Topaz Float Valve page — 3/4", 1" and 1-1/4" inlets in long and short tail.
Simple, reliable, built to last — the Jobe Topaz 3/4" Long Tail keeps your troughs full without the fuss.