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I e-mailed the manufacturer directly. They responded copy and paste next, Dear Miles, Sorry for the delay reply! Frankly speaking, I don't have such detailed information of all seal parts, all the needful parts we put in the spare parts package with each handpump. 15# to replace 8# is correct...

I bought a GK1 and HB-35 together but on my first fill of the GK1 the HB-35 popped the opening valve seal. Luckily in the spares part #15, 3-level Piston Seal, seemed to be the same as the band like seal on the opening valve assembly. On the opening valve assembly I found that band like seal...