Orion Motor Tech Coolant Pressure Tester Kit, 31pc Master Coolant Vacuum Refill Kit with 23 Radiator Adapters, Radiator Cooling System Pressure Tester Kit with Vacuum Pump Vacuum Purge & Refill Tool

This dual-purpose OMT kit for both Pressure Test AND Vacuum Test+Fill offers incredible value, with custom-fit adapters for nearly every radiator and cap type—nearly matching AutoZone's $370 single-purpose rental kit which only performs Pressure Tests. After using it for 6 months on multiple cars of different brands (and connection types) from USA to Japan and Korea, I’m extremely satisfied.The kit helped me quickly identify a large radiator leak by producing a visible spray of coolant as a result of pump pressure on the closed cooling system, something I couldn't achieve just by idling the engine. (Important note: Don’t over-pressurize beyond your radiator cap’s rating to avoid creating new leaks.)The included hand pump is great for pressure testing radiators and caps, reaching up to 40 psi (2.5 bar) on its high-quality gauge. That's higher than the pressure rating of any radiator cap I've ever yet seen, so it covers the maximum possible pressure I'll ever test to.In addition to immediately detecting obvious large leaks, the pressure gauge can be used for sustained "hold tests" to find small leaks that may only drip over time. If necessary, you can use UV dye in the coolant, then apply pressure to reveal even the smallest leaks with help from a UV Light at night. I’ve found that combation of Pressure Pump PLUS UV helpful for diagnosing slow leaks that may cause coolant loss over months, tool, but still eventually risking overheating and blown head gasket if not found and repaired.A standout feature of this OMT kit is its included vacuum test and fill tool, which is usually an extra cost for a separate kit from other brands. This tool uses induced vacuum from an air compressor to remove all air gaps during coolant refills, preventing problems like cylinder head cracks or heater failure which may occur after any less perfect fill with air gaps.OMT includes this vacuum tool with the pressure tester at the cost of just this one combo kit. That's unlike competitors such as Harbor Freight, which charges $95 for a single-purpose pressure test kit, then an additional $88 for their completely separate tool for vacuum test and fill.The vacuum tool in this OMT kit is also well-designed, working effectively with all 22 of the kit's shared custom-fit snap-on radiator adapters which also snap onto the pressure test tool to assure a secure seal. It created a solid vacuum of 25 inches (0.85 bar) for me today when blowing my 90 psi compressed air through its vacuum ejector. Then I only had to close a quarter-turn ball valve to lock in that strong induced vacuum and confirm no leaks anywhere in my car’s entire coolant loop after that vacuum held throughout a 10-minute test. Finally, by opening one ball valve to its coolant intake [after previously draining old coolant and then vacuum hold testing as I'd just finished in the close-up photo], I was extremely pleased to [finally; after 40 adult years of growing expertise as home mechanic to family & friends] refill exactly like the best-equipped pro repair shops [see wider photo, just as I finished my setup to fill from its induced deep vacuum [in my pre-drained empty Cooling System] to Zero Remaining Vacuum [which then means 100% filled with no air bubbles; equalized with the atmospheric pressure which is pushing down outside - on the remaining new coolant in my siphon bucket]. This Vacuum Test+Fill tool has just added a professional level tool to my home garage - saving time and more importantly, perhaps saving engines from overheating failures due to coolant leaks I wouldn't have found without it.Overall, this OMT kit offers the most quality and value I could find for under $100 (as I write this, in Spring 2025). It has brought me professional-level capabilities for testing and repairing cooling systems on a variety of cars—eliminating many times its cost in shop labor for cars of family and friends while ensuring reliable, leak-free repairs.

Biggest tester adapter kit I've ever bought. I should be able to connect to most radiators out there. It also includes a bleeder attachment. Great fitting, quality adapters. Easy to use. Designed well. Great price. Functions well.

Works very good for the price. Some of them do NOT have a perfect seal but it gets the job done. Overall a good product for the price.

I had a slow coolant leak on my truck. I purchased this item as it was cheaper than what I could get at Harbor Freight and had more adapters. Once it came in, I used it same day and found the leak in my radiator. I also used this to push the air out of the cooling system, it made refilling the radiator very easy

Worked for every vehicle I've needed it for

better than expected for the price. Paid for itself on the first day.

I was able to isolate and detect my coolant leak in less than 30 minutes. Better to pressurize a cold engine than mess around with scalding coolant. After correcting the problem, the successful pressure test provides peace of mind. The Adapter availability included is impressive. All items seem to be of quality. I used this on my Audi S4 B8.5

pros: The pressure tester / leak finder does work well with the added caps. Make sure you put the right adapter cap on to get a good seal.cons: The evacuation tool (coolant filler) works very slowly and does not hold neg pressure well.I have been an automotive mechanic for almost 30yrs, and I have been using a tool, that I purchased off the "tool truck" about 15yrs ago that recently broke, so I purchased this kit to replace it. I would not purchase this kit again knowing how well and how fast my old tool worked. I was trying to save money and I knew better.If you depend on your tools daily, don't buy this set / kit.