Topeak Super Chuck Dual Valve Pump Connector

I recommend this product

If you are pumping your tyres to 100 PSI pressure with a track pump, you will probably find the original pump head starting to hiss and pop off when it starts to wear after a year or two. If you can't get spares for it, this is the fix: it fits onto the usual thick walled hose easily with a clip. It's a quality solid brass item that you can get a spare rubber seal for.
It's really for Presta valves, but there is a schrader adapter included.
There is similar one from SKS, but I haven't seen it: it can't be better but it's cheaper.

Exactly what I needed: the old pump head would no longer make a good seal and stay on the presta valves. This works great. Trivial to fit, forms a good seal and lets me get good pressure into the tube. The pressure release button helps with removal, if not entirely stopping me skinning my knuckles (I now push gently from the rim!). Rescued my track pump from the skip. SJS service was spot on too.

I recommend this product

I got just what I ordered, for the money they said and received it when they said I would!

Brilliant service . . . if SJS did lager it would probably be the best . . . PROBABLY!!!!