1-1/2" (M1011 only) or 2" TestanDrain Model 1011 Relief Kit. These pressure relief valve trim kits are compatible with AGF TESTanDRAIN Models 1011 and 2511 and can be installed without draining the entire system. The basic pressure relief kit includes a Model 7000L pressure relief valve (175 PSI standard), bypass tube, barbed elbows (2), and hose clamps (2). The "T" pressure-gauge trim kit includes a Model 7000L pressure valve (175 PSI standard), Model 7500 pressure gauge, Model 7600 3-way universal gauge valve, tee, plug, nipples, bypass tube, barbed elbows (2), and hose clamps (2).