Disse pumpene fungerer på samme måte som 301 mini pumper men de gir et annet blandingsforhold tilpasset spesial herderne 207 og 209. Blandingsforholdet for disse herderne er en del herder(vekt) til 3 deler 105 Resin.NB! Et trykk på hver pumpe gir riktig blandingsforhold.Advarsel: Må ikke brukes med 205-206 herdere.EXACT MIXING RATIOSPumps make measuring the correct ratios of resin to hardener very easy. Make sure you have the right pump for the containerthese are 301A for the A pack size (1kg of WEST SYSTEM 105 epoxy resin with 0.2kg of 205 Fast or 206 Slow hardener) and 301B for the B pack size (5kg of 105 epoxy resin with 1kg of 205 Fast or 206 Slow hardener). There are also 303 pump sets for use when working with 207 Special Coating or 209 Extra Slow hardeners.Epoxy is very easy to use but has to be mixed in exactly the right ratio of resin to hardener. This differs from polyester resin, where the curing process has already beenacceleratedand just requires a small percentage