Speaking of bullet-proof plumbing, these are about the best seacocks currently available. Not some glorified ball-valve, they are bronze and marine grade (non-de-zincifying) brass. Using a conical valve lubricated with a grease nipple, it’s virtually jam-proof. Just loosen the nuts on the keep plate, inject some grease, and it’ll turn. Should last a lifetime. Available from Defender.
Link: Blakes Seacocks
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Hi They are not jam proof, mine were left with the lever covering one of the bolts, the boat was left unattended for two years and the seacock seized solid (1.1/2 inch outlet) In an attempt to free it I ended up breaking it! Stupid I know!