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This particular Blocker is 4
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For use with SC20 and M92722 Mast Platforms (Not compatible with Raymarine RD418D / 418HD domes)
The Rule 3700 range of small submersible bilge pumps are recommended for discharge heads up to a maximum of 4 metres
- Both the brake tension release & detents can be installed & adjusted from the outside
PSS HS 2-1/4" Shaft Seal 3-1/4" Stern Tube communication-vhf This particular Blocker is 4The PSS (Packless Sealing System) shaft seal is designed as a maintenance free alternative to the traditional packing glands and stuffing boxes. The PSS does not require a greaser drip to lubricate the shaft, if does not require packing and it doesn't need adjusting or maintaining once installed. The design of the PSS seal makes it 100% watertight when installed correctly to prevent water leaking into the bilge, and it also protects the propeller