Will varsol harm rubber seals on valves and cylinders?

Yes, Varsol, which is a petroleum-based solvent, can harm rubber seals on valves and cylinders. Prolonged exposure can cause rubber to swell, soften, or degrade, leading to leaks and compromised sealing. It's advisable to use alternatives specifically designed for cleaning that are safe for rubber components. If rubber seals are exposed to Varsol, they should be inspected and potentially replaced to ensure proper function.