Just finished putting a new service valve on my "on demand" water heater. The builder's plumbers must have really cranked down on the copper fittings and split a couple and they recently started leaking. Replacement went just fine however, I disturbed a Pex fitting close to the water heater and it is seeping a bit. Sigh...... I know there will be future projects or leaks to deal with so I'm interested in what crimping tools are worth looking into?