Very good detail..fits and works well

Fit my 2005 Tacoma perfectly. I was slowly losing coolant and couldn't find a drip/leak. After installing this replacement, the level went up and I just filled the reservoir to max. Turns out the spring for pressure release was worn out on the old one.

Last month, I replaced the radiator on my 99 Accord EX V6 having survived 20-years! Replacing all of the hoses, clamps and coolant, I replaced the radiator cap as well with this one (model R126) purchased from PT Warehouse. It's made in China, but appears to be a quality product. It's been installed now for about a month, and there have been no leaks around the mouth of the radiator and no cooling issues. The OEM cap had rubber gaskets, and the R126 cap has silicone gaskets which is a great upgrade. You can see from the image that the OEM cap gaskets have indentations where it sealed against the radiator (but never leaked). We'll see if this cap lasts another 20-years!

Fits 2007 Toyota Tacoma 4.0L Prerunner. The seals were silicone but blue instead of green. The package didn't instill confidence, the graffics on it look like a cheap toy package. Overall the part fit well, seals nice and firm and spring force similar to my stock one.I deducted one star because there was some metal dust on the seals that I had to wash out with my garden hose before installing the part. It was very little dust but I didn't want to take a chance on a unseen pile falling into my radiator. A quick washout with hose sprayer made it nice and clean.I cleaned up the pink residue from the old cap and will be checking to see if this clears that up.

Let me start with a general comment about radiator caps. Far too few Americans replace their radiator caps regularly as preventative maintenance. We are never told to by our owners' manuals, after all. Well, think of this though. Most radiator caps, such as this one being reviewed, is designed to hold an exact pressure in your vehicle's cooling system. Radiators heat up to temperatures higher than the boiling out of water, and they cool to as cold as the coldest Minnesota winters. This constant cycling between the temperature extremes, not to mention the constant spring pressure of the springs themselves, can only lead to fatigue of the springs and rubber seals in the caps. Most people replace these caps only when it starts to leak (or to go with their replacement radiators). Well, if you tested the pressure threshold of the caps well before that, you will find the caps no longer hold the pressure they were designed to, in this case, 16psi. Why is holding that pressure important? Well, the coolant in your vehicle needs to go slightly above boiling temperature of water. Pressurising it will allow it to do so. But there is expansion that occurs when the coolant is heated. The cooling system is designed to handle a certain amount of that pressure, and the radiator cap is designed to allow the excess coolant resulting from expansion beyond that designated pressure to exit the cooling system and into the "overflow tank" or reservoir, and will be sucked back into the system when it cools. If the excess coolant is not expelled, the system will overpressurize and the weakest link will blow, usually that's a rubber hose, sometimes it's a thin or weakened spot of the radiator itself, or a gasket on the engine. Engineers decide what pressure that will be, and that is designed into the radiator cap. A weakened radiator cap will expel coolant too soon, reducing the efficiency of your cooling system as the coolant boils out due to lack of pressure. It could also expel too much coolant, therefore causing some of it to overflow out of your "overflow tank." It can also cause some of that coolant to leak out away from the coolant reservoir. Either way the coolant cannot be recovered, which can lead to air pockets in your cooling system, which can cause overheating and/or detonation, which adds to more overheating.So back to this specific cap. What's so great about it? 1. Did you see the bright green silicone seals? Those hold their shape better and last longer than standard rubber. 2. Did you see that it is made in Japan? Doesn't take an engineering degree to know from first hand experience that it means a lower chance of failure than if it was from.... China? 3. Did you see the price? It's cheaper than half a gallon of coolant!I believe many Japanese auto makers recommend replacing coolant every 2 years. Why not change the cap at the same time, with a high quality one?