(2) 38F & 39F
( valve tank adapter to by pass or piping boss )
Old part number 150A144.
New part number 1040459.
These are the o-rings that go between the By Pass ( old or new version )
OR Piping Boss ( manifold, yoke ), and the Tank Adapter ( old 155 or newer 255 version use the same o-rings ).
Also, these 3 o-rings used between the Tank Adapter and the meter turbine assembly
( if you have the 460, 960, or 760 timer used on your valve ).INSTALLATION TIPS:
And the most important thing I learned when dealing with this Connection ( besides the need for new o-rings and silicone
) is that the o-rings are put on the Valve body side First, and then the By Pass or Yoke ( piping boss ) must be pushed on straight ( not one side then the other ), and when "bolting" it back together, you would first make each bolt hand tight
, before using tool to "really" tighten each one.
It's important that everything is straight, and that no pressure ( up, down, or either side ) is being applied. Either while attaching, or if after attached, by the water pipes ( not pulled up, down or to one side or the other ).
The last item is a problem we have seen with many brands / types of By Pass connection. If pipes are pulling on the connection, it increases the change for a "leak".