I agree colors make it easier but I generally don't have colors to choose from in zip ties lying around the workshop.That's how my FIL has all of our big equipment, drives me nuts. I'd rather have color coded zip ties, much easier that way, but the OP was referring to his FEL hoses.
Boltonhooks.com sells zip ties "kits" with multiple colors for this specific reason. Also sells dust caps (that arn't color coded) thus, the zip ties to go along with them.I agree colors make it easier but I generally don't have colors to choose from in zip ties lying around the workshop.
Well I found some paint pens wide ones and got 4 colors cleaned the fittings and painted each one with it own color, DONE DEAL and has lasted longer that anything else I Have found. As a matter of speaking HAVE HAD SEVERAL FRIEND THAT REQUESTED THE SAME THING DONE TO SAVE THEM THE Aggregation we have all had , GOOD LUCK
They shouldn't be getting filthy if you are connect the cap and plugs together when they are not being used.I used colored zip ties on mine. They sell them for a few bucks a bag at Walmart.
I think the OP needs 3/8" caps and plugs. The problem with them is they are always filthy when you need to use them.
They are available through JD for about $4 a pop so a cap and plug is around $8. You look the caps up on the loader parts page and the plugs can be found on the tractor parts page.
I bought some yeller ones from JD to use on my grapple lines.
The caps are on the loader on mine and I could only plug 2 of the plugs in(On the tractor).... One ripped off sometime in the last 9 years and the yellow dangled and filled with dirt as the MMM lift was plugged in when the loader was off. Just keep them in your toolbox, they can't rip off or get dirty.They shouldn't be getting filthy if you are connect the cap and plugs together when they are not being used.