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The 3/8" hose that came on the LL II was a special hose that had more ability to expand and contract. The newer ones don't need it to control pulsing. That's taken care of by the pump control now. But - the large hose will help any machine deliver more volume and pressure at the tip. probably not an issue if you only use 17s and 19s, but if you use two guns or larger tips, it will take some of the load off the pump.

A 3/8" hose Will make ANY striper operate and perform better, hydraulic, direct drive, or diaphragm. More consistent pressure from start to finish. Lower pressure settings especially with bigger tips. Masking of pressure spikes and dips from changeover and pump action. Longer packing and other component life. Potentially lower engine speeds (fuel savings and longer life). These are just a few reasons why the 3/8's" hose helps. The Graco hose also has the added cost of adding stainless steel ferrules (make contact with paint) which is important in terms of compatibility with the new fast dry waterbornes. There are a few downsides Increased cost, slightly longer color changes (mere seconds longer), and larger hose while stenciling. For the difference in price, why not take advantage of the benefits. With today's fast dry waterbornes, the original 3500's and 5000's would benefit more from the 3/8" hose than today's 3900 and 5900. Regarding aftermarket hose, there are some good and some not so good.

I replaced the 3/8" hose with a new one and painted about 1000' for a local walmart last night. I cleaned the machine good with water and painted about 8,000 ft of single center line today. When I went to clean the machine this evening the 3/8" hose was clogged. What I've been doing is pull a little paint through the 3/8" hose and then use the other hose (1/4" whip hose) to paint from. By not pulling paint all the way through the 3/8" hose would this cause the hose to clog? Thanks in advance!