Dudley - If possible, PM or email to me a broad-view photo of your current spray-rig, along with a close-up photo that shows your current pump's intake and discharge fittings/connectors (and the pump's make & model#). Also, confirm the diameter of your spray-hose (3/8" or 1/2") and identify the type of wand/gun in use - and its spray-tip size if known.
Different pumps and brands usually have their own unique intake and discharge ports (couplers, m/f threaded, barbs, etc).
If you currently have a ShurFlo pump, the model that I have in mind might be an easy retrofit replacement. If not, it might be better to source a higher volume pump that has the same port-fittings as your current pump - or, go through the adapter-process (sometimes a real pain).
Like so many other mechanical assemblies, all of the components within a spray-rig must "match-up" to maximize its performance (pump, hoses, gun, spray-tip, etc).
The photos and make/model of your existing pump - and the hose/gun descriptions - should tell me what I need to know.
