Large hydraulic hose end chamber with a 1/2 in NPT nipple, which you can connect to your hydraulic coupler, not included. Has more than 25 cu in chamber capacity, and a drain plug. This size is suitable for most multi-cylinder attachments or implements, as well as for most single cylinder attachments or implements which will provide an extended length of time between drain intervals. Can be used with a bushing to adapt up to your 3/4″ or 1″ hi-flow couplers. To be used on hydraulic hoses while not in use to prevent pressure build up from thermal expansion. Drain plug can be used to periodically drain any residual oil in the hose end chamber to prevent build up. Handle/Hook is used to hang the hose end chamber vertically while hooked to implement. Made in USA.