Description
Dometic Seastar Seal Kit Including Tool Front Mount Cylinder Screw HS5157
Seal kit to suit HC5345 (291003), HC5347 (291014), HC5348 (291012) and HC5358 (291016) – including -3 variants.
It is also the replacement seal kit for HC5342 and HC5365 obsolete cylinders with screw-in fittings.
Includes tool.
Seastar Hydraulic Service Kit. Service Kits and seals for the range of SeaStar cylinders.
HS5167 HS5157 Seal Kit Instructions
Please note: These are not the cheap copies that some shops are selling – these are made by and branded Dometic / Seastar.
These are genuine Dometic / Seastar seal kits. Dometic is the new owner of Seastar and packaging may now be using the Dometic branding. This Dometic Seastar kit is a product of Canada
Compatible cylinders:
- HC5340, HC5341, HC5342, HC5343, HC5344, HC5345, HC5346, HC5347, HC5348, HC5358, HC5365, HC5375, HC5394, HC5445, HC6750, HC6751, HC6752, HC6753, HC6754 and HC6755
- HC6345, HC6358
- Including -3 variants
Warning: Always ensure your hydraulic system is depressurised before attempting any seal replacement to avoid injury or damage.
Boat Hut Insight
When replacing hydraulic seals, it’s worth remembering that even the best seal kits won’t fix a cylinder that’s badly scored or corroded inside. Before fitting your new seals, take a moment to inspect the cylinder bore carefully. A smooth, clean surface will ensure a longer-lasting repair and save you from having to repeat the job sooner than you’d like. Also, keep in mind that genuine kits like this one, branded by Dometic / Seastar, may cost a bit more upfront but will save you from headaches caused by inferior copies — think of it as investing in your boat’s reliability and your own peace of mind.
Tip: Keep a small bottle of hydraulic fluid handy when rebuilding your cylinder to lubricate seals during installation and avoid damage.



