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PR 91 Welch plugs 
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Joined: Fri Nov 07, 2008 9:05 am
Posts: 617
Location: Western Victoria
Car(s): Bellett GT, Bellett Sedan, Prince Skyline GT, Porsche tractor, Lanz Bulldog, 996 Carrera 4,Prince Miler,
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PR91 Welch plugs are 1.25" diameter - (must be a carry over from Hillman days! ) not 32mm (very close but not quite!)

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Fri Jun 18, 2021 5:01 am
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Joined: Mon Nov 15, 2010 3:11 am
Posts: 249
Location: Adelaide
Car(s): 1967 GT Bellett
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Hey KJB
Just like the spin on oil filters with 3/4-16 thread not 20 mm
Cheers


Sun Jun 20, 2021 12:11 am
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Joined: Tue Sep 16, 2008 11:54 am
Posts: 2534
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Alot of cars are 3/4 oil filters. Is the most common size even in Japanese stuff.


Thu Jun 24, 2021 8:16 am
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