You are looking at a Brand new Jabsco Twist and Lock Pump Assembly
The Twist ‘n’ Lock pump assembly can be used on current and previous Jabsco manual toilets, the benefit with this new design is that the water will not leak from the top of the assembly such as the older versions and other makes of sea toilet. All you will need to do is unbolt the old pump assembly and install your new Twist ‘n’ Lock version without having to remove the complete toilet.
This product is suitable for the Jabsco 29090 & 29120 series manual toilets and also includes the base valve gasket.
If you have any questions please ask