{"product_id":"marine-pressure-and-vacuum-tester-combination-diagnostic-gauge-with-hose-and-npt-adapters-sierra-18-99530","title":"Sierra Pressure and Vacuum Tester 18-99530, Combination Marine Engine Diagnostic Tool","description":"\u003cp\u003eThe Sierra Pressure and Vacuum Tester (18-99530) is a combination diagnostic tool that lets a technician perform both pressure testing and vacuum testing with a single unit, eliminating the need for two separate testers. A valve on the side of the gauge housing switches the tool between pressure mode and vacuum mode, so fuel pumps, cooling systems, crankcases, and other marine engine components can be checked for leaks, blockages, or improper operating pressure without swapping tools mid-job. The gauge housing is built from a metal and plastic combination for durability in a shop or dockside environment, and the fittings use NPT thread style for compatibility with standard marine and automotive test points. The kit is supplied complete and ready to use, including a hose assembly and two adapters, so it can be connected to a variety of test fittings out of the box. At 10 x 11 x 3.4 inches and 2.2 pounds, it is compact enough to store in a tool box or service kit while still offering a full-size gauge face for accurate readings. This tester is intended for marine technicians and serious DIY boat owners who need a reliable way to verify fuel system pressure or check for vacuum leaks as part of routine engine diagnostics and troubleshooting.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-99530\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Pressure and Vacuum Tester\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Combination pressure and vacuum testing in one unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Style:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal, Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 10 x 11 x 3.4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 2.2 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Items:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Hose assembly and two adapters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Specialty Tools\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99530 tester actually do?\u003c\/strong\u003e It performs both pressure testing and vacuum testing in a single gauge unit, so one tool covers checks that would otherwise require two separate testers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do you switch between pressure and vacuum modes?\u003c\/strong\u003e A valve on the side of the 18-99530 gauge housing is flipped to change the tool from vacuum mode to pressure mode, with no disassembly required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included with this tester?\u003c\/strong\u003e The 18-99530 kit ships complete with a hose assembly and two adapters, allowing it to be connected to test points right out of the box.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and weight of the unit?\u003c\/strong\u003e The Sierra 18-99530 measures 10 x 11 x 3.4 inches and weighs 2.2 pounds, making it compact enough for a standard tool box or service kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the gauge housing made of?\u003c\/strong\u003e The housing combines metal and plastic construction, giving the 18-99530 durability for regular shop and dockside use.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread style do the fittings use?\u003c\/strong\u003e The 18-99530 uses NPT thread style fittings, matching standard marine and automotive test connections.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this tester suitable for checking fuel pump pressure?\u003c\/strong\u003e Yes, the combination pressure and vacuum function of the 18-99530 makes it suitable for verifying fuel pump output pressure as part of routine engine diagnostics.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this tool check for vacuum leaks in cooling or crankcase systems?\u003c\/strong\u003e Vacuum mode on the 18-99530 lets a technician check for vacuum leaks or improper vacuum readings on applicable engine systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gauges come in the box?\u003c\/strong\u003e The 18-99530 is supplied as a single combination gauge unit rather than two separate pressure and vacuum gauges.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a professional-grade tool or for occasional home use?\u003c\/strong\u003e The metal-and-plastic build and included hose and adapters make the 18-99530 suitable for both professional marine technicians and DIY boat owners doing their own diagnostics.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the tester come with a warranty?\u003c\/strong\u003e The Sierra 18-99530 is covered by a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988446294235,"sku":"SIE-18-99530","price":303.07,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-551-34PV_lg__88396.1748447530.500.750.jpg?v=1785188529","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-pressure-and-vacuum-tester-combination-diagnostic-gauge-with-hose-and-npt-adapters-sierra-18-99530","provider":"Good Vibes Marina","version":"1.0","type":"link"}