http://www.palmer-pursuit.com/online-catalog/rock.htm

See the "Rock the Boat"
It uses the larger Standard "Rock" Regulator"

We tried using the smaller "Micro Rock", and built our own piercing head out of stainless steel tube and a brass fitting. However the Micro rock does not maintain the down stream pressure(it has no relief valve). Once everything is pressurized, the Micro rock continues to bleed higher pressure into the system till a line bursts, or pops off a fitting.