[2001/Oct/08] Source for the elusive O-rings to seal the PDWA used in various mid-70s britcars. You want Ethylene Propylene (EPR) O-rings. Before you run off and order, a little investigation work is in order. In my limited study, there appears to have been about 4 different PDWA models used on our Triumphs. The excellent PDWA article on the VTR pages shows one model, my '75 TR6 uses a later model PDWA, and so on. Aside from external looks, the internal piston sizes vary, hence the need to investigate. The first thing you should do is to disassemble your unit and measure the diameter of the "channel" on the piston where the O-ring seats then measure the Cross Section (width) of the old O-ring. With this information, you need to determine the size of the O-ring so check out PSP at: http://www.pspglobal.com/nf000series.html and look at their "series" charts to find your size. O-rings are "sized" by the cross sectional diameter of the O-ring material and the inner diameter of the ring. For example, my O-rings are Series 000-010, which translates to a cross-section (width) 0.070" +or- 0.003" and an inside diameter between a minimum 0.234", mean 0.239", and maximum 0.244". You have to know yours before you order. -- Gary Klein <gklein@toad.net>

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