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Currenly im using the NA6 one on my BP-W4 convsrsion.
While it fits. Its not exactly confidence inspiring. A
As its not a OEM fit. Its 29 years old. A little cracked here & there. But ice nit found a nb8a hose anywhere.
What solutions are there.
Is the brake booster on the NB8A different?

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You can split the booster hose open and recover the one way check valve and then replace the hose for a better fitting type.
I just spent hours wedging the check valve along a tight fitting hose for a custom fitting.
All i can say is rubber grease and mechanic's gloves are your friends..
[url]Booster hose https://imgur.com/a/rbvHPnf[/url]