20mm for T 47 & 48 Series, HP4040, HP5535 & TS4040 Pumps.

T 47 & T 48 Series Pumps

CPH, Emperor, EZ, TC, TH, TP, T, TT & TV Pumps.

Fits T Series 48 pumps, T series 51 pumps

XT / XM Series

RK, RKA, RKV, XRV, XRCV Series

XRV, RKV