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TracTuff RBB/ RBC Water Bypass Block Off


After years of selling the OG water bypass adapter... I finally saw a sales trend that made it easy to decide on manufacturing a dedicated block-off.

The decision to make this product comes from not wanting to overcharge customers for the more expensive water bypass adapter, only to plug it! All the features that make my water bypass adapter the BEST on the market, are incorporated into this. T

Just because I make this, it does not mean that I recommend eliminating the water bypass function, it has a very valuable role in how the cooling system functions... so please do your research and understand the pros and cons associated with deleting it! 

NOTE: If you didn't select a sensor port and you would like to add one now... drill it here and flip it over and tap it for your sensors thread pitch from the front. Do NOT start tapping from this side!

Please understand that the intake manifold shown is JUST AN EXAMPLE. Please also understand that my water bypass block off was designed and machined for a perfect fit when using the Genuine Honda PRB/ PRC manifold shown. I cannot control what aftermarket intake manifold companies do with their shape. If the water bypass block off does not fit properly, the manifold casting is to blame, and you will need to make a choice on which of the two products will be modified. I recommend you remove material from the manifold so as to not make a mistake that will move the o-ring position and cause a leak. 

Also,  nowhere in this write-up do I mention the use of OR recommend Hondabond or any RTV sealant. This is NOT an oversight or accident. It is NOT needed. The o-ring seals directly against the cylinder head. Do NOT install the water bypass block off on top of any type of gasket!!

The water bypass block off does not support EGR. By purchasing this product, it is assumed that you either don't have an engine with a complete EGR system or you have deleted it by using a water neck that renders the passage useless. A useless passage does not require being sealed (which is why I did not incorporate a seal).

Installation Guide


Start by installing the o-ring into the recess on the adapter’s backside and set the adapter aside. If you need assistance with keeping the o-ring in place, use a small dap of grease or sealant.


Grab the stainless steel link and longer 40mm Genuine Honda flanged bolt and install the bolt into the smooth hole in the link.



Install the bolt and stainless link into the right-most intake manifold flange bolt hole. Tighten lightly with the link facing upward.



Grab the shorter 28mm Genuine Honda flange bolt and adapter and install the bolt into the lower bolt hole.



Take the bolt and adapter and install it over the exposed water & egr ports. Thread the bolt into the cylinder head until it is hand tight. Do NOT install the adapter over a gasket.


Grab the stainless steel set screw and thread it into the stainless link. The pointed set screw will tighten into the hole well but in some extreme cases it may be a good idea to use some medium grade Loctite.


Swing the stainless link and set screw down until it lines up with the pilot hole of your choice.


Tighten the 8mm intake manifold and Water Bypass bolts to 18 lb. ft. of torque and tighten the set screw until you have sufficient crush on the adapters o-ring. Congratulations! You're done.