I used propane to check for vacuum leaks.
我用丙烷检查有没有真空泄漏。
Hoses: Check radiator, cooling, heating and vacuum hoses for cracks and bulges.
软管：检查散热器、冷却、供热和真空等软管有无裂缝和膨胀处。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
TK - DL可以检测压力真空断路阀，减压防回流阀或双止回阀总成。
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