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Blue Water Propeller Shaft Seal

A propeller shaft flexible seal unit designed to be retrofitted to existing stern assemblies or installed in new boats: the Blue Water Seal.  More than five years of testing and refining has produced a proven system that is MOT approved for use in commercial boats and is now used as standard equipment by well known boat builders.

The seal element can be easily removed should it be damaged or need replacing with no need to replace the entire unit, as new seal elements are readily available and inexpensive.  

The Blue Water Seal has a built-in safety feature to keep sea water out of the boat as, should the seal element be damaged in any way, the seal retaining plate can be converted into a gland follower by placing a ring of greasy hemp gland packing under it to form an effective temporary seal allowing seal replacement to be made at the first convenient opportunity.
The units are made from cast admiralty bronze, lined with marine grade white metal bearings and come in sizes from 25 - 100 mm (1 - 4 inch) shaft diameters.  Spare parts are readily available.

 


Fibreglass Stern Tube Model
Stern Tube Flange Model.

 

Fibreglass Stern Tube Model

 

Product
Number		 Shaft
Diameter		 Length
A		 Fibretube
O.D.
P684/1 1 "       160 1-3/4 "     (44 mm)
P685/1 1-1/4 " 170 2-1/4 "     (57 mm)
P686/1 1-1/2 " 175 2-1/2 "     (64 mm)
P687/1 1-3/4 " 180 3 "           (77 mm)
P688/1 2 "       205 3 "           (77 mm)
P689/1 2-1/4 " 200 3-1/2 "     (77 mm)
P698/1 2-1/2 " 270 4 "          (100 mm)
P758/1 2-3/4 " 250 4-1/2 "   (115 mm)
P747/1 3 "       250 4-1/2 "   (115 mm)

 

Stern Tube Flange Model

 

Product
Number		 Shaft
Dia.		 Length
A		 Length
B		 Dia.   
C		 Dia.
D		 Hose I.D.
E		 Length
F		 Length
F		 Center
H		 Center
I		 Dia.
J
P684 1 " 170 22.2 43.0 1-5/16 " 44 57.1 76.2 38.1 55.5 5/16 "
P685 1-1/4 " 180 30.5 50.9 1-5/8 "   50 70.0 89.0 47.7 66.5 3/8 "  
P686 1/1/2 " 185 36.5 60.4 2"          60 89.0 101.6 65.0 79.3 3/8 "  
P687 1-3/4 " 190 38.1 66.7 2-1/4 64 95.4 114.3 70.0 89.0 3/8 "  
P688 2 " 215 50.9 82.5 2-1/2 "   76 114.3 140.0 89.0 114.3 7/16 " 
P689 2-1/4 " 210 61.8 82.5 2-3/4 "   76 125.0 142.5 95.4 114.3 1/2 "  
P698 2-1/2 " 280 76.2 95.3 3"          89 137.0 155.0 98.5 120.6 1/2 "  
For Dimensions of SEAL UNIT over 2-1/2" email Sales