Caravan inline water filters is a great way to ensure that any chemicals or impurities are removed before it reaches your caravan sink. Ideal for great tasting drinking water, the caravan in line water filter easily attaches to your existing fittings. The threaded option is for installation on pre-existing pipe systems. It can be installed inline or anywhere on the internal plumbing, AFTER THE PUMP. The caravan inline water filter is one of the most versatile products as it is supplied with bare threads due to the numerous different pipes available for RVs. If you want to install hose connectors, we suggest any male ½ inch threaded connection, including water directors that drop down to 13mm or a t-section fitting if you need to divert water in separate directions.