A unique feature of our GSG, HPcp/HPcpV and CP pumps is the twistlock system of barrel closure. Twistlock minimizes barrel thickness and reduces cartridge change out time by eliminating heavy end cover bolting and the addendant hydraulic streaching gear. The following illustrations show the system in operation.

	Section through the barrel showing the cover ready for insertion.
	Section through the barrel showing the cover partially inserted.
	Detail showing the cover at the 50% of twist point as it is turned into the fully locked position.
	Detail showing the cover fully located.