Which type of hose features a synthetic rubber or plastic lining and a thicker outer cover?

The type of hose that features a synthetic rubber or plastic lining and a thicker outer cover is indeed the covered hose. This design is specifically intended to enhance durability and improve resistance to the wear and tear that hoses typically endure during firefighting operations.

Covered hoses are constructed to protect the inner lining, which is made from synthetic materials, against abrasion, cuts, and environmental factors. The thicker outer cover serves as a safeguard, allowing the hose to maintain its functionality and integrity, especially in rigorous conditions typical of firefighting scenarios. This added protection is essential for ensuring that the hose can withstand the high pressures and potential damage encountered during use.

In contrast, booster hoses usually have a smaller diameter and a more lightweight design, focusing on ease of deployment and portability rather than the heavy-duty protection offered by a thicker outer cover. Attack hoses are designed for delivering water to the fire and may not always have a thicker exterior. Flexible hoses are geared towards applications needing maneuverability, but they may not have the same characteristics in terms of lining and protective covering as a covered hose. Therefore, the emphasis on synthetic rubber or plastic lining combined with a thicker outer cover rightly identifies the covered hose as the correct response.