[Smart Carpet]

would it be possibly to have a hoster on your belt that all you had to do is clip the hose on to it something like a quick release

Holster?  Yes.

Not very practical (IMO) as it usually makes your leg wet and restricts your movement somewhat.

[bobplum]

would it be possibly to have a hoster on your belt that all you had to do is clip the hose on to it something like a quick release

Holster?  Yes.

Not very practical (IMO) as it usually makes your leg wet and restricts your movement somewhat.

agree

[Dave Willis]

What we need obviously is a tap that works as a cam 
The hose passes under the open cam then the lever can be closed to pinch the flow off anywhere on the hose and locked in position.

[Nathanael Jones]

What we need obviously is a tap that works as a cam 
The hose passes under the open cam then the lever can be closed to pinch the flow off anywhere on the hose and locked in position.

Exactly what I was trying to say. It should be easy to combine this setup with a trigger.

It should also be very cheap to produce - it'd be nearly all plastic, no valves or connectors etc.

[Dave Willis]

Even something as basic as this would work but would need modifying.

http://www.google.co.uk/imgres?q=hose+pinch+clamps&hl=en&biw=1366&bih=643&tbm=isch&tbnid=OwPRNsr5BJklVM:&imgrefurl=http://www.overclock.net/t/847223/do-i-need-a-fillport-and-or-a-qdc-how-do-i-drain-my-loop&docid=o6XL9D-rhLjSQM&imgurl=http://www.usplastic.com/catalog/images/products/valves/400/59199p.jpg&w=400&h=400&ei=9n9UUNeSE-So0QXRooCAAQ&zoom=1&iact=hc&vpx=1100&vpy=300&dur=9329&hovh=225&hovw=225&tx=157&ty=134&sig=111120647880885266799&page=3&tbnh=142&tbnw=132&start=44&ndsp=27&ved=1t:429,r:12,s:44,i:249

[Nathanael Jones]

Its probably even something you could print yourself:

http://reprap.org/wiki/Main_Page