See-Through Constriction SPTThis SPT has tighter lower section fitted with a see through liner. A polished acrylic constriction is fitted between the upper and lower section. The head of the penis is drawn through the constriction with each pulsation of the milker. Choose an internal diameter and length for the lower section, and a internal diameter for the constriction. Scroll down for detailed sizing information. An adaptor kit is required (+18) for use with the original Surge

30 mm or 35mm constrictions fit into 40mm SPTs

So consider adding 10 or 20mm if you would like the ring just under the groove

Our Heavy Duty Coiled Cables look like they mean business (and they do)

Perfect for long sessions

Internal Diameter (30mm

SeriousKit milkers are fitted with adjustable vacuum regulators

Length: The Length of the lower section is available in 100mm

model=WVP5&sw=0

Some people prefer a larger bag mount after pumping

Available in Standard (up to 110cm/43") or Large (over 110cm/43") with four buckles to create the perfect fit

4mm banana jacks that will connect to any SeriousKit device

Alternately the base ring scrotal electrode can be paired with either the sound / cup or ring electrode