Question 1

How do you know what size you need. 1/4 or 3/8. Have Simpson 3000 PSI. It fits both sizes at depot depending on application ie plumbing, compression?

Accepted Answer

/14 NPT (National Pipe Thread) is approximately 1/2 inch diameter on the outside, while 3/8 NPT is approximately 5/8 inch diameter on the O.D.  (Pipe Thread is based on a standard iron pipe's inside diameter) - Also most pipe threads have a slight taper to them (helps them fit up tightly)Homelite part number 308169004 is 1/4 NPT while 308769005 is 3/8 NPT

Question 2

I need the part for a Ryobi 3100 psi. Does this valve fit on my machine?

Accepted Answer

I have a Ryobi model RY 80030 - 3000 psi and it fits mine perfectly.

Question 3

How do you fix the thermal valve when it snaps off

Accepted Answer

if it snaps off at the threads as in breaking off , you would need something like an "easy-out" tool to unthread it.If by "Snaps off" you mean it dumps water-  The thermal valve activates when the pump water overheats (keyword: Thermal)  If the pump runs for too long without using the washer (Spray wand), the water in the pump often will overheat - when that happens the valve pops open and dumps hot water on the ground until cool water comes along and cools down the valve so it reseats - if it won't reseat or if it leaks all the time, the only fix is to replace it - if it keeps popping off too often, there is either a problem in the pump itself or the valve is bad. - they can often fail quite quickly if there's a pump problem causing overheating or too frequent overheating of the valve as it often melts or deforms.

Question 4

Will this fit the Simpson 3000 psi Costco pressure washer with Honda engine?

Accepted Answer

As far as I know, these thermal relief valves only come in two sizes, 1/4" pipe thread and 3/8" pipe thread. In every other way they seem generic in their operation. Their purpose is to relieve pressure from the INLET hose, if the water is too hot, say from lying in the sun too long. I bought two and it was a perfect fit. My machine is a 2700 psi with Honda engine from SAMs. My size was 1/4" pipe thread. The reason I bought two is just in case I broke another one off taking the machine down the concrete steps. So, if you have the same thread size, it will work. The price is right.

Valve Type	Pressure Relief Valve
Number of Ports	3
Inlet Connection Type	National Pipe Tapered
Outlet Connection Type	National Pipe Tapered
Outlet Connection Size	0.75 Inches
Item Dimensions	1 x 1 x 2 inches
Material Type	Plastic

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RYOBI Homelite 678169004 Pressure Washer Thermal Release Valve

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